22-250 loads (& velocities)

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Re: 22-250 loads (& velocities)

Post by Bill » 03 May 2021, 8:57 pm

fair enough SCJ429 maybe you need to get out more often :drinks:
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Re: 22-250 loads (& velocities)

Post by bladeracer » 04 May 2021, 9:51 am

goldiexxxx wrote:Hoping someone can validate my 22-250 results. I have a Ruger M77 MkII that I bought in as-new condition. I have an accuracy load of 36.5gr of AR2208 with a 55gr Sierra Gameking (Super roo), however, the velocity as tested with a Magnetospeed is only 3455 fps. The ADI load data has the max load of 36gr as 3730 fps with the same bullet.
What is going on here? ADI manual unrealistic? or Magneto inaccurate?

Can anybody provide any answers?

Cheers,

Goldie


There are lots of variables that could be the cause of such discrepancies.
Are you neck-sizing? I have seen 100fps more from the same piece of brass after full-length sizing it compared to being neck-sized.
Are you loading to the specified length? If you load longer you will increase case volume causing lower pressure.
Is you throat longer than standard?
Are you using Winchester brass as ADI used?
Is your scale calibrated? Try weighing a 40gn bullet on it.

ADI's max load is the max they saw in their testing (although they most likely just computer modeled it), your max load could be significantly lower or higher than theirs. Until you start seeing pressure signs you are not close to maximum.
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Re: 22-250 loads (& velocities)

Post by goldiexxxx » 04 May 2021, 7:09 pm

Yes, full length sizing.
Not loading to specified length.
Specified = 2.350
Jam length = 2.418
C.O.L = 2.380
Don't know if the throat is longer than standard, I'd expect every manufacturer makes barrels differently.
Using once fired Hornady brass. Its now at least twice fired.
Been using my Hornady electronic scales, which I have read can be inaccurate. Today I borrowed an RCBS balance scale and my electronic scales are perfectly calibrated to the balance scales (yeah surprised me too).

I note that in my Lyman manual, the max load for a 55gr V-Max is 37gr of Varget (AR2208) however, even with more powder than ADI, their velocity is still lower.
How accurate are those Magnetospeed chronographs? Can I rely on that device to be accurate. I think so, because I am getting a 3.7" drop between 100m and 200m, although, I dont even get that amount of drop from my 223 with 11gr less powder with the same bullet. Confusing for sure.
I will keep loading higher until I see pressure signs. I can fit 39gr of AR2208 without even compressing the powder. Still I will start working from 37gr up.

Thanks for your input blokes.
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Re: 22-250 loads (& velocities)

Post by Larry » 04 May 2021, 7:19 pm

The magneto speeds are pretty accurate there are not a lot of sources of error in the technology they use.
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Re: 22-250 loads (& velocities)

Post by SCJ429 » 04 May 2021, 9:51 pm

Bill wrote:fair enough SCJ429 maybe you need to get out more often :drinks:

Thanks Bill, I got out last weekend with my 223 and shot four groups, two of the best measured 0.350. not my best shooting but not bad for a factory rifle with 4,000 rounds down it. How did you go?
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Re: 22-250 loads (& velocities)

Post by goldiexxxx » 08 May 2021, 8:04 pm

goldiexxxx wrote:Hoping someone can validate my 22-250 results. I have a Ruger M77 MkII that I bought in as-new condition. I have an accuracy load of 36.5gr of AR2208 with a 55gr Sierra Gameking (Super roo), however, the velocity as tested with a Magnetospeed is only 3455 fps. The ADI load data has the max load of 36gr as 3730 fps with the same bullet.
What is going on here? ADI manual unrealistic? or Magneto inaccurate?

Can anybody provide any answers?

Cheers,

Goldie


I resolved my problem, simply kept adding more powder until I got the required speed. Settled on 38.5gr of AR2208 for 3740 fps with a half inch group at 100m. Seems like the ADI load data is just WRONG. Cases looked good and no extra effort to lift the bolt, with basically no noticeable drop from 100 - 200m. Now that's what I had expected.
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Re: 22-250 loads (& velocities)

Post by Blr243 » 08 May 2021, 8:22 pm

Good news. Great result. Accurate, fast and safe ....and I learned something too. I had not heard of magneto speed prior to this post. So I googled it and was pleasantly surprised to see a chronograph that attaches to the rifle, BINGO. The barn had one in stock so out with the card and done. No more stupid tripods for me. Perhaps I Just might even shoot my tripod on purpose as a ceremony especially signifying the end of my tripod mounted chrono days .
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Re: 22-250 loads (& velocities)

Post by AZZA'S HJ47 » 08 May 2021, 10:41 pm

38g of 2208 in my m77 ruger pushes a 53g vmax to 3750 and whislt im fireforming the brass to suit the ackley chamber im still getting half inch groups @100. Speeds are almost the same after brass is reloaded.
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Re: 22-250 loads (& velocities)

Post by Bill » 09 May 2021, 9:03 am

SCJ429 wrote:
Bill wrote:fair enough SCJ429 maybe you need to get out more often :drinks:

Thanks Bill, I got out last weekend with my 223 and shot four groups, two of the best measured 0.350. not my best shooting but not bad for a factory rifle with 4,000 rounds down it. How did you go?


Thats some good shooting SCJ429 sounds like youve got an accurate gun :thumbsup:

Cheap new bullet for the 6mm on friday, ran out of 8208 and not enough 2206H on hand so substituted in Re10x. Zero reloading data available for this combo so I was ultra cautious as its a bit on the fast side. 2nd group went 0.4 so I found the low node, groups opened up with more speed and top speed a bit away 1-1.5gr. Will play around with the seating depth once Ive found or not found a top accuracy node. I only started using a powder thrower recently, teaspoon is back in the draw :lol:

64gr at 3360fps.
When a guy is digging his own grave, you don’t fight him for the shovel.

Success leaves clues, Fools follow failure !

20 Hornet, 218 Bee, 256 WM, 6mm ARC, 6.5 Grendel, 6.5x55 Scan, 270 Win, 357 Mag, 358 Win, 9.3x62, 500 A Square
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Re: 22-250 loads (& velocities)

Post by Skinna » 09 May 2021, 12:56 pm

Bill wrote:
SCJ429 wrote:
Bill wrote:fair enough SCJ429 maybe you need to get out more often :drinks:

Thanks Bill, I got out last weekend with my 223 and shot four groups, two of the best measured 0.350. not my best shooting but not bad for a factory rifle with 4,000 rounds down it. How did you go?


Thats some good shooting SCJ429 sounds like youve got an accurate gun :thumbsup:

Cheap new bullet for the 6mm on friday, ran out of 8208 and not enough 2206H on hand so substituted in Re10x. Zero reloading data available for this combo so I was ultra cautious as its a bit on the fast side. 2nd group went 0.4 so I found the low node, groups opened up with more speed and top speed a bit away 1-1.5gr. Will play around with the seating depth once Ive found or not found a top accuracy node. I only started using a powder thrower recently, teaspoon is back in the draw :lol:

64gr at 3360fps.


Good to see youre keeping the tea spoon Bill...will still come in handy for dosing up on that cement mate... :lol:

Maybe need to find the spectacles though, cos i think this is a thread about 22-250, not 6mm mate... :lol:

(couldnt resist some good ol' time banter :lol: )
:D
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Re: 22-250 loads (& velocities)

Post by Bill » 09 May 2021, 2:37 pm

Hey Skinna I sold my 22-250 last year and built an improved version....... just happens to be a 6mm. ;)
When a guy is digging his own grave, you don’t fight him for the shovel.

Success leaves clues, Fools follow failure !

20 Hornet, 218 Bee, 256 WM, 6mm ARC, 6.5 Grendel, 6.5x55 Scan, 270 Win, 357 Mag, 358 Win, 9.3x62, 500 A Square
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Re: 22-250 loads (& velocities)

Post by Varmtr » 21 May 2021, 3:10 pm

50gr NBT
39gr Hogdgon CFE-223 ( awesome powder pity Winchester no longer imports )
Fed BR primers
Nosler brass.
coal to suit my chamber with 4 thou jump.

magneto speed 3980 fps av with es of 22 fps.
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Re: 22-250 loads (& velocities)

Post by Skinna » 22 May 2021, 11:51 am

Varmtr wrote:50gr NBT
39gr Hogdgon CFE-223 ( awesome powder pity Winchester no longer imports )
Fed BR primers
Nosler brass.
coal to suit my chamber with 4 thou jump.

magneto speed 3980 fps av with es of 22 fps.


Hey Varminter, can i ask, do you know, or can you measure the seating depth from the point of how much of the NBT is in the case.?
If you do or can measure, dont worry about the boat tail or how much bullet is actually touching the case, just the general measurement of in & out of the case, & maybe an Ogive measurement of the bullet itself too,
Just curious, thanks. :)

(dont ask much hey... :lol: )

:drinks:
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