Anyone getting into this new calibre?

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Re: Anyone getting into this new calibre?

Post by bladeracer » 13 Aug 2021, 3:46 pm

Oldbloke wrote:7mm-08 (since 1958) 308-270
A good example of splitting straws, or is it marketing bigrich? Lol.


7mm-08 is .284/.308 though ;-)
So much better than .308!
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Re: Anyone getting into this new calibre?

Post by bladeracer » 13 Aug 2021, 4:11 pm

bigrich wrote:Yeah blade, I agree. 277 is out in the cold for high BC projectiles. That’s why they’ve invented this new round according to wikapedia. The case will take long projectiles apparently. As a hunting round I think 270 win is the bees knees.
Funny you should mention a 308-270 wildcat. I was thinking the same thing recently. I found making 358 brass from 308 really easy, and thought about making my own custom rifle on 270 caliber. The main reason is the inexhaustible supply of free 308 brass. But 270 Winchester is that well catered for I probably won’t bother


Exactly, any short-action based on the 12mm-bolt-face 2.800" cartridge (.243, .260, 6.5Creedmoor, 7mm-08, .308, etc) can be fitted with a .277" barrel cut with a .308 chamber, with no magazine or feed problems, very easy. Cheap or free .308Win brass is formed by running it into a shortened .270Win sizing die, or modify a .308 neck-die with a .270Win insert. If you wanted to form it in two steps you can use a readily available 7mm-08 die (I size .303 and .30-06 down to 6.5mm with no problems). If you wanted a little more efficiency go to an AI chamber.

And if you get bored with it, just swap the .308/7mm-08/.243 barrel back in and you have the original rifle again.

As this could be easily retrofitted to any AR10/SR25 platform with existing mags it makes no sense to me to invent a new cartridge for the military either.
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Re: Anyone getting into this new calibre?

Post by bigrich » 13 Aug 2021, 5:10 pm

bladeracer wrote:
bigrich wrote:Yeah blade, I agree. 277 is out in the cold for high BC projectiles. That’s why they’ve invented this new round according to wikapedia. The case will take long projectiles apparently. As a hunting round I think 270 win is the bees knees.
Funny you should mention a 308-270 wildcat. I was thinking the same thing recently. I found making 358 brass from 308 really easy, and thought about making my own custom rifle on 270 caliber. The main reason is the inexhaustible supply of free 308 brass. But 270 Winchester is that well catered for I probably won’t bother


Exactly, any short-action based on the 12mm-bolt-face 2.800" cartridge (.243, .260, 6.5Creedmoor, 7mm-08, .308, etc) can be fitted with a .277" barrel cut with a .308 chamber, with no magazine or feed problems, very easy. Cheap or free .308Win brass is formed by running it into a shortened .270Win sizing die, or modify a .308 neck-die with a .270Win insert. If you wanted to form it in two steps you can use a readily available 7mm-08 die (I size .303 and .30-06 down to 6.5mm with no problems). If you wanted a little more efficiency go to an AI chamber.

And if you get bored with it, just swap the .308/7mm-08/.243 barrel back in and you have the original rifle again.

As this could be easily retrofitted to any AR10/SR25 platform with existing mags it makes no sense to me to invent a new cartridge for the military either.


we're definatly on the same page with this sort of stuff blade . why design a new unique case that can be hard to obtain or have supply problems ? the 222/223 , 308 , 30-06 , and win mag cases can be resized to whatever you need for minimal cost . i converted a 243 mod 70 to 358 some time ago (as did big pete ) with no issues . well , except for one smith's workmanship anyway . i could screw my old 243 barrel back on if i wanted , but it's not as much fun as 358 . the amount of free brass i have makes it very attractive conversion and i get silly good accuracy with this rifle . the only thing about mine is the cases stick a little , i'm running it stout in the loads , but i put part of it down to not much taper in the 358 case . i have read the odd account of difficult extraction with ackleyed stuff at times . has anyone on here had these issues with ackley cases ?
i read a little while ago of a US custom builder converting AR10's to 338 fed and 358win . that's some firepower :D
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Re: Anyone getting into this new calibre?

Post by JimTom » 15 Aug 2021, 6:56 am

I have had a look into this cartridge and I like it. There are a few interesting YouTube clips on it. I can’t see the problem with something shooting .277 high BC projectiles. If I were in the market Id buy one before a .270 provided brass and dies were available here.
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Re: Anyone getting into this new calibre?

Post by bigrich » 15 Aug 2021, 9:48 am

JimTom wrote:I have had a look into this cartridge and I like it. There are a few interesting YouTube clips on it. I can’t see the problem with something shooting .277 high BC projectiles. If I were in the market Id buy one before a .270 provided brass and dies were available here.


It does sound like a ballistically good thing JT . The only grievance I have with this sort of thing is unique hard to get brass and dies. Thanks to bladeracer I might have another project in mind. 308-270 . :roll: I’ll make my own brass for free from giveaway stuff from tacti-cool shooters at the range. I’m looking into it......
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Re: Anyone getting into this new calibre?

Post by JimTom » 15 Aug 2021, 8:18 pm

Yeah mate, I am guessing the supply of brass and dies for the 6.8 Western could be an issue in the first instance. No doubt in a few years they will be more available.
I like the sound of the new project, 308-270 Sounds super. Be sure to let us know if you proceed with it mate.
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Re: Anyone getting into this new calibre?

Post by ZaineB » 15 Aug 2021, 10:59 pm

JimTom wrote:Yeah mate, I am guessing the supply of brass and dies for the 6.8 Western could be an issue in the first instance. No doubt in a few years they will be more available.
I like the sound of the new project, 308-270 Sounds super. Be sure to let us know if you proceed with it mate.


277 Fury
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Re: Anyone getting into this new calibre?

Post by bigrich » 16 Aug 2021, 7:12 am

ZaineB wrote:
JimTom wrote:Yeah mate, I am guessing the supply of brass and dies for the 6.8 Western could be an issue in the first instance. No doubt in a few years they will be more available.
I like the sound of the new project, 308-270 Sounds super. Be sure to let us know if you proceed with it mate.


277 Fury


ya wanna name it after brad pitt's tank ? :lol: :lol: :lol: :lol:

i'm sure this hybrid has been done many times before , i think it would have marginal speed advantage over 7-08 . the main reason for this idea is cheap brass, short action and a little more punch than 6.5 swede . but as someone pointed out it's splitting hairs :thumbsup:
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Re: Anyone getting into this new calibre?

Post by Downunder » 16 Aug 2021, 7:41 am

It surprised me the other day to learn that the most widely accessible rifle ammunition in the states at this time is 6.5C

If the military adopted the 6.8 Western it would go off....... :D
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Re: Anyone getting into this new calibre?

Post by ZaineB » 16 Aug 2021, 9:10 am

bigrich wrote:
ZaineB wrote:
JimTom wrote:Yeah mate, I am guessing the supply of brass and dies for the 6.8 Western could be an issue in the first instance. No doubt in a few years they will be more available.
I like the sound of the new project, 308-270 Sounds super. Be sure to let us know if you proceed with it mate.


277 Fury


ya wanna name it after brad pitt's tank ? :lol: :lol: :lol: :lol:




its already been done and named that, that is why I wrote it.
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Re: Anyone getting into this new calibre?

Post by JohnV » 16 Aug 2021, 9:42 am

A potential problem with some of these newer specialised cartridges is while they do have some ballistic advantages if they don't capture a big enough slice of the sales market they can suddenly disappear . To get those better down range ballistics you are needing a faster twist barrel and more expensive higher BC bullets to gain anything .
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Re: Anyone getting into this new calibre?

Post by bigrich » 16 Aug 2021, 12:35 pm

ZaineB wrote:
bigrich wrote:
ZaineB wrote:
JimTom wrote:Yeah mate, I am guessing the supply of brass and dies for the 6.8 Western could be an issue in the first instance. No doubt in a few years they will be more available.
I like the sound of the new project, 308-270 Sounds super. Be sure to let us know if you proceed with it mate.


277 Fury


ya wanna name it after brad pitt's tank ? :lol: :lol: :lol: :lol:




its already been done and named that, that is why I wrote it.


ahh okay . i like to joke but ...... :D

i read about another hybrid , 358 mitchell express . 8x57 resized . i like the sound of this . i do realize there is the 9x57 , but 358 projectiles are easier to come by :thumbsup:
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Re: Anyone getting into this new calibre?

Post by bigrich » 16 Aug 2021, 12:38 pm

JohnV wrote:A potential problem with some of these newer specialised cartridges is while they do have some ballistic advantages if they don't capture a big enough slice of the sales market they can suddenly disappear . To get those better down range ballistics you are needing a faster twist barrel and more expensive higher BC bullets to gain anything .


i suppose if your a silhoette or F class shooter this would have appeal regardless , but as a recreational hunter it doesn't appeal to me for the reasons you've given johnv :thumbsup:
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Re: Anyone getting into this new calibre?

Post by JohnV » 16 Aug 2021, 1:03 pm

bigrich wrote:
JohnV wrote:A potential problem with some of these newer specialised cartridges is while they do have some ballistic advantages if they don't capture a big enough slice of the sales market they can suddenly disappear . To get those better down range ballistics you are needing a faster twist barrel and more expensive higher BC bullets to gain anything .


i suppose if your a silhoette or F class shooter this would have appeal regardless , but as a recreational hunter it doesn't appeal to me for the reasons you've given johnv :thumbsup:

Exactly . Competition shooters chasing performance will go to all kinds of expensive lengths but for the average hunter it's not really required unless you are chasing longer range varmint type hunting then there is some justification if you can afford it.
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Re: Anyone getting into this new calibre?

Post by bigrich » 16 Aug 2021, 5:03 pm

JohnV wrote:
bigrich wrote:
JohnV wrote:A potential problem with some of these newer specialised cartridges is while they do have some ballistic advantages if they don't capture a big enough slice of the sales market they can suddenly disappear . To get those better down range ballistics you are needing a faster twist barrel and more expensive higher BC bullets to gain anything .


i suppose if your a silhoette or F class shooter this would have appeal regardless , but as a recreational hunter it doesn't appeal to me for the reasons you've given johnv :thumbsup:

Exactly . Competition shooters chasing performance will go to all kinds of expensive lengths but for the average hunter it's not really required unless you are chasing longer range varmint type hunting then there is some justification if you can afford it.


243 and 25-06 would float my boat for long range pest control :thumbsup:
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Re: Anyone getting into this new calibre?

Post by animalpest » 16 Aug 2021, 8:24 pm

Dropped some camels at 450+ with my 26/06 last week in 30-35km/hr winds. Does that equate to long range bigrich?
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Re: Anyone getting into this new calibre?

Post by Die Judicii » 16 Aug 2021, 10:25 pm

bigrich wrote:
deye243 wrote:Just yet another ho-hum Calibre that will be impossible to get brass for in three or four years I'll stick the 7mm REM Mag and 300 WIN MAG and 260 REM covers the lot for where I live


Yeah, that’s capitalism. Invent new products just to sell something when the old products work just fine.
In that caliber area I have a 270 win that works just fine. Anyone remember the Winchester short magnums? Brass for them isn’t that easy to find at times

I don’t want to rain on your parade harrynsw, but I am a little sceptical of the firearms industry at times


Plus "10" on that. :thumbsup:
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Re: Anyone getting into this new calibre?

Post by bladeracer » 16 Aug 2021, 11:27 pm

bigrich wrote:
JimTom wrote:I have had a look into this cartridge and I like it. There are a few interesting YouTube clips on it. I can’t see the problem with something shooting .277 high BC projectiles. If I were in the market Id buy one before a .270 provided brass and dies were available here.


It does sound like a ballistically good thing JT . The only grievance I have with this sort of thing is unique hard to get brass and dies. Thanks to bladeracer I might have another project in mind. 308-270 . :roll: I’ll make my own brass for free from giveaway stuff from tacti-cool shooters at the range. I’m looking into it......


I took photos of the. 270/.308 and the Improved version page in the Handloaders Guide to Cartridge Conversions yesterday, but didn't get a chance to post them today.
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Re: Anyone getting into this new calibre?

Post by JimTom » 17 Aug 2021, 6:23 am

I had a quick search and yep the 6.8x51 fury seems to already exist.
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Re: Anyone getting into this new calibre?

Post by bigrich » 17 Aug 2021, 10:44 am

animalpest wrote:Dropped some camels at 450+ with my 26/06 last week in 30-35km/hr winds. Does that equate to long range bigrich?


Long enough range for me mate :thumbsup:
That’s the 25-06 in it’s element. There used to be a forum member yumastepside who was relating a story of a m17 custom in’06 he had where he would knock goats around 600 now and then.
Definitely a fine cartridge :thumbsup:
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Re: Anyone getting into this new calibre?

Post by simmo » 17 Aug 2021, 12:35 pm

Is that the civi/marketing name for the new US Military 6.8x51 cartridge?
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Re: Anyone getting into this new calibre?

Post by bladeracer » 17 Aug 2021, 2:50 pm

bladeracer wrote:I took photos of the. 270/.308 and the Improved version page in the Handloaders Guide to Cartridge Conversions yesterday, but didn't get a chance to post them today.


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.270/.308 and .270/.308 Improved
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.270/.308 Dimensions
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.270/.308 Description
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.270/.308 Improved Dimensions
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.270/.308 Improved Description
20210816_081013b.jpg (164.48 KiB) Viewed 7762 times
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Re: Anyone getting into this new calibre?

Post by disco stu » 17 Aug 2021, 4:37 pm

simmo wrote:Is that the civi/marketing name for the new US Military 6.8x51 cartridge?


Is the one you're talking about the polymer case? Did some googling when you mentioned this
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Re: Anyone getting into this new calibre?

Post by bigrich » 17 Aug 2021, 9:10 pm

thanks for the info blade , very interesting caliber :thumbsup:
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Re: Anyone getting into this new calibre?

Post by bladeracer » 17 Aug 2021, 11:25 pm

bigrich wrote:thanks for the info blade , very interesting caliber :thumbsup:


I don't actually have any chamberings in.277", so it is piquing my interest as well :-) I have eight 6.5mm and two 7mm rifles, a .277 would fit nicely between them.
Another Ruger American in 7mm-08, a .277" barrel, and a .308Win chamber reamer may be in my near future. I bought my 7mm-08 before they offered it in the Predator version, so it's a good excuse to grab a predator, and rebarrel the existing one.
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Re: Anyone getting into this new calibre?

Post by Communism_Is_Cancer » 18 Aug 2021, 11:47 am

I hate change. I adapted to the 338lapua because of the fire power but I am still living in the mid 20 century and earlier with my choice of calibres.
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Re: Anyone getting into this new calibre?

Post by bigrich » 18 Aug 2021, 12:19 pm

Communism_Is_Cancer wrote:I hate change. I adapted to the 338lapua because of the fire power but I am still living in the mid 20 century and earlier with my choice of calibres.


One of the greatest old school calibers, 8x57 deserves more attention than it gets
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Re: Anyone getting into this new calibre?

Post by bladeracer » 18 Aug 2021, 12:47 pm

bigrich wrote:
Communism_Is_Cancer wrote:I hate change. I adapted to the 338lapua because of the fire power but I am still living in the mid 20 century and earlier with my choice of calibres.


One of the greatest old school calibers, 8x57 deserves more attention than it gets


Agreed, great cartridge!
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Re: Anyone getting into this new calibre?

Post by JimTom » 21 Aug 2021, 12:18 pm

For those who are interested, this article compares .277 cartridges including the 277 Fury, the new 6.8 Western, and others, against the .270 Win.

https://youtu.be/M2jJLbIJQpA
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Re: Anyone getting into this new calibre?

Post by bigrich » 21 Aug 2021, 5:18 pm

JimTom wrote:For those who are interested, this article compares .277 cartridges including the 277 Fury, the new 6.8 Western, and others, against the .270 Win.

https://youtu.be/M2jJLbIJQpA


interesting. thanks for posting the link :thumbsup:
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