7mm rem mag light loads

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7mm rem mag light loads

Post by Cherza » 29 Nov 2017, 8:01 pm

Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 9:14 pm

Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam


Light in what way? Low velocity or low recoil, or just generally less potent than factory?
Have you got Trailboss?
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Re: 7mm rem mag light loads

Post by Cherza » 29 Nov 2017, 9:31 pm

bladeracer wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam


Light in what way? Low velocity or low recoil, or just generally less potent than factory?
Have you got Trailboss?

Low recoil but lot too low in velocity if thats possible.
Looked a trail boss data may be too light though do you think? The velocity is verry low I dont think I should go quite that low.
Thanks
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 10:00 pm

Cherza wrote:
bladeracer wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam


Light in what way? Low velocity or low recoil, or just generally less potent than factory?
Have you got Trailboss?


Low recoil but lot too low in velocity if thats possible.
Looked a trail boss data may be too light though do you think? The velocity is verry low I dont think I should go quite that low.
Thanks


If you just want to reduce recoil try a lighter bullet and knock off some velocity. Using a powder that has less mass also reduces recoil.
A 150gn bullet on 72gn of AR2225 at 2980fps is going to have more recoil than if it's launched by 62gn of AR2217SC at the same velocity. Maybe AR2209 for heavier bullets and AR2208 for lighter ones would be good choices.

I'm shooting the 160gn Speer Hotcore on 37.4gn of BM8208 at 2550fps in 7mm-08. With AR2209 you'd be running 12.5gn more powder than 7mm-08 (43.5gn and 55.5gn) to make 200fps more velocity with the same bullet and powder. If you dropped it back to about 51.5-52.0gn you'd be pushing about the same velocity as 7mm-08 but still with more recoil due to the extra 8gn of powder mass.

Yes, Trailboss is for low-velocities, which is useful too but probably not what you are chasing.

EDIT: I checked the numbers on a recoil calculator.
A 62gn charge behind a 160gn bullet at 2980fps in an 11lb rifle makes 17ft/lbs of recoil energy. With a 72gn charge it makes 19.2ft/lbs of recoil energy, about 14% more recoil.
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 10:04 pm

Regarding Trailboss, I'm shooting the Speer Hotcore 145gn on 10.5gn of TB at about 1150fps in 7mm-08.
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Re: 7mm rem mag light loads

Post by Oldbloke » 29 Nov 2017, 10:13 pm

Another one that needs a cup of cement..... Sorry couldn't help myself. :silent:

The 7mm rem mag kicks like the proverbial. Probably should have bought a 308.
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 10:13 pm

bentaz wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam

Just curious as to why you'd buy a magnum cal and then want to load it down?


I'm a big fan of reduced loads myself.
In this case as an example, it lets you run hot 7mm-08 type performance without pushing the case or barrel life, and still gives you that extra grunt when you need it. I don't see any need to load hot, just load it mild to make best accuracy and when you need more bang throw in some hot loads, or even better, grab a more potent rifle.
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 10:14 pm

Oldbloke wrote:Another one that needs a cup of cement..... Sorry couldn't help myself. :silent:

The 7mm rem mag kicks like the proverbial. Probably should have bought a 308.


Yeah, a mate had a 7mm Rem Mag in Perth. He offered me a shot but I declined :-)
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Re: 7mm rem mag light loads

Post by Cherza » 29 Nov 2017, 10:49 pm

bentaz wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam

Just curious as to why you'd buy a magnum cal and then want to load it down?

Brought it because it was cheep looked into it and here mixed storys about recoil going to reload anyway.
After a while I will probably load them hotter and get more outof it.
Good question though you know sometimes with guns you see it and buy it then think hmmm I shouldnt of got that.
Thats what I did but hey stuff you can never have enough guns.
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Re: 7mm rem mag light loads

Post by bladeracer » 29 Nov 2017, 10:55 pm

Cherza wrote:Good question though you know sometimes with guns you see it and buy it then think hmmm I shouldnt of got that. Thats what I did but hey stuff you can never have enough guns.


My dealer likes to play tricks on me when I go to pick up a rifle he'll tell me they sent the wrong caliber or something. My response is usually, "Doesn't matter what caliber it is, I can always find a use for it!" :-)
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Re: 7mm rem mag light loads

Post by Cherza » 29 Nov 2017, 11:07 pm

We all buy stuff we dont need or cant use mate Id rather have a gun collection than pay bills
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Re: 7mm rem mag light loads

Post by straightshooter » 30 Nov 2017, 6:43 am

Light loads in magnum cases can be a recipe for disaster.
There is an effect something like detonation that has been known to destroy magnum cartridge chambered rifles that have been very underloaded.
The process goes something like this:
The primer ignites correctly but it's flash is somewhat dissipated in the empty space in the case. There is enough flash to burn off the deterrent coating on the powder but not enough flash to maintain smooth continuity of combustion over the whole surfaces of the propellant but nonetheless there is still some combustion. What happens is the propellent then detonates because there is no deterrent left to moderate the speed of ignition.
The answer is to use a magnum for what it was intended for.
Don't go below any reputably published minimum load.
If you really need or want something that has recoil performance like a 223 or 243 then entertain those as an option.
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Re: 7mm rem mag light loads

Post by Nick-J » 30 Nov 2017, 6:53 am

It's not a 7mm mag, however I have loaded my 300wsm to the starting charge of AR2208 with a 150gr bullet. Excellent accuracy and feels quite a bit more mild to shoot than a Remington factory load.
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 9:03 am

straightshooter wrote:Light loads in magnum cases can be a recipe for disaster.
There is an effect something like detonation that has been known to destroy magnum cartridge chambered rifles that have been very underloaded.
The process goes something like this:
The primer ignites correctly but it's flash is somewhat dissipated in the empty space in the case. There is enough flash to burn off the deterrent coating on the powder but not enough flash to maintain smooth continuity of combustion over the whole surfaces of the propellant but nonetheless there is still some combustion. What happens is the propellent then detonates because there is no deterrent left to moderate the speed of ignition.
The answer is to use a magnum for what it was intended for.
Don't go below any reputably published minimum load.
If you really need or want something that has recoil performance like a 223 or 243 then entertain those as an option.


its called SEE "secondary explosion effect"
a light load can blow a firearm up quicker than a heavy load
what happens with SEE is that the powder lays flat in the cartridge as it is fired and the primer ignites the top layer of the powder sending the projectile into the bore then it sits in the bore as the rest of the powder is burnt till the pressure rises enough to cough the projectile out but the rifle explodes because of a blockage in the bore by the projectile

I hope that makes sence
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 9:05 am

bladeracer wrote:Regarding Trailboss, I'm shooting the Speer Hotcore 145gn on 10.5gn of TB at about 1150fps in 7mm-08.


are you using a can
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Re: 7mm rem mag light loads

Post by Oldbloke » 30 Nov 2017, 10:55 am

Write to adi. They should be able to advise you. Most can be down loaded but cases with large capacity are a different story.
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Re: 7mm rem mag light loads

Post by bladeracer » 30 Nov 2017, 12:06 pm

marksman wrote:
bladeracer wrote:Regarding Trailboss, I'm shooting the Speer Hotcore 145gn on 10.5gn of TB at about 1150fps in 7mm-08.


are you using a can


I don't need a can, the cartridge is very quiet.
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 1:29 pm

bladeracer wrote:
marksman wrote:
bladeracer wrote:Regarding Trailboss, I'm shooting the Speer Hotcore 145gn on 10.5gn of TB at about 1150fps in 7mm-08.


are you using a can


I don't need a can, the cartridge is very quiet.


great idea :drinks:
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Re: 7mm rem mag light loads

Post by bladeracer » 30 Nov 2017, 1:51 pm

marksman wrote:
bladeracer wrote:
marksman wrote:
bladeracer wrote:Regarding Trailboss, I'm shooting the Speer Hotcore 145gn on 10.5gn of TB at about 1150fps in 7mm-08.


are you using a can


I don't need a can, the cartridge is very quiet.


great idea :drinks:


It would kill most things with good shot placement into the brain, but it doesn't deform at this velocity so it's not for hunting.
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 2:06 pm

I work occasionally with a pro hunter who uses cans and it has to be a brain shot at reasonable distances, no more than 200 but most are under 100
lots of projectile trialling to see what works emphatically, usually seirra's are found to work best
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 2:16 pm

for those who are interested in finding out more on SEE
http://www.reloadammo.com/liteload.htm
a rifle blow up in hand loads is usually put down to a double charge but most of the time you could not put a double charge in the case
a lot of reloaders believe you cannot blow up a rifle with an under charge

a good one on prevention
http://www.guns.com/2011/07/31/handload ... on-effect/
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Re: 7mm rem mag light loads

Post by bladeracer » 30 Nov 2017, 2:52 pm

marksman wrote:I work occasionally with a pro hunter who uses cans and it has to be a brain shot at reasonable distances, no more than 200 but most are under 100
lots of projectile trialling to see what works emphatically, usually seirra's are found to work best


Yes, if he's also using subsonic ammo. But you don't have to use subsonic ammo through a suppressor.
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Re: 7mm rem mag light loads

Post by marksman » 30 Nov 2017, 3:45 pm

both are used, the subsonic where required for anonymity although there is still noise and full house loads that are not quietened at all
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Re: 7mm rem mag light loads

Post by Baronvonrort » 30 Nov 2017, 6:46 pm

Cherza wrote:
bladeracer wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam


Light in what way? Low velocity or low recoil, or just generally less potent than factory?
Have you got Trailboss?

Low recoil but lot too low in velocity if thats possible.
Looked a trail boss data may be too light though do you think? The velocity is verry low I dont think I should go quite that low.
Thanks


The best place to look would be in the ADI guide- page 142 http://www.adi-powders.com.au/handloaders/pdfs/130117_Handloaders_guide_6th_edition_WEB.pdf

If chasing lower recoil then try the 100gr Sierra hollow points around minimum load or up to the Nosler 120gr, the lighter projectiles around min load will be lowest recoil.

The loads around minimum will also help with barrel life, if recoil is a problem you could try a muzzle brake.
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Re: 7mm rem mag light loads

Post by Cherza » 01 Dec 2017, 2:09 am

marksman wrote:for those who are interested in finding out more on SEE
http://www.reloadammo.com/liteload.htm
a rifle blow up in hand loads is usually put down to a double charge but most of the time you could not put a double charge in the case
a lot of reloaders believe you cannot blow up a rifle with an under charge

a good one on prevention
http://www.guns.com/2011/07/31/handload ... on-effect/

Interesting
Thanks
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Re: 7mm rem mag light loads

Post by Cherza » 01 Dec 2017, 2:23 am

Found this regarding safety is this ok or not?
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Screenshot_20171129-203439-1024x1820.png
Was thinking about something like this
Screenshot_20171129-203439-1024x1820.png (494.82 KiB) Viewed 8211 times
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Re: 7mm rem mag light loads

Post by Gamerancher » 01 Dec 2017, 8:10 am

That is basically a load that you would use in a 7-08. H4895 is the same as AR2206H. I use a similar load in a .35 Winchester which has a slightly smaller case capacity than your 7mm Rem Mag. It is a very mild load behind a 130gr bullet in 7mm-08.
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Re: 7mm rem mag light loads

Post by Cherza » 01 Dec 2017, 8:56 am

So 41.2 grains will that only half fill the case with powder?
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Re: 7mm rem mag light loads

Post by Gamerancher » 01 Dec 2017, 9:48 am

Dunno, weigh out a load and put it in a case. See where it fills the case to. I don't have a 7mm RM case to see for myself.
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Re: 7mm rem mag light loads

Post by Gwion » 01 Dec 2017, 11:38 am

bentaz wrote:
Cherza wrote:Hi there, can anyone help with some light load data for the 7mm remington magnum please.
Sam

Just curious as to why you'd buy a magnum cal and then want to load it down?


Yep. I don't understand the whole concept of this post...
Yes, i load down my 223 to around 22wrm but i wouldn't do it with my 7mm.
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