buckstix
(.400 member)
18/12/17 04:27 AM
Re: An A-Square - 338 A-Square Mag Cal - An Awesome Story

Hello,

Back from the range today. I'm very happy with the results. Upped the powder charge to 105 grains of IMR 4831 with the same 160g Barnes bullet.



Take a look at the individual readings.

1- 3531 fps
2- 3527 fps
3- 3527 fps
4- 3554 fps
5- 3527 fps

3533 fps ave = 3550 fps corrected to muzzle
11 fps sd

3 of the 5 readings were the same and the standard deviation was 11 fps. Primers were flat but no signs of excessive pressure.

Looks like my prediction of 3700 fps may be attainable.

3-1/2" high at 100 yds = 4-1/2" low at 400 yds
4500 ft/lbs energy at the muzzle with 2050 ft/lbs remaining at 400 yds

I forgot to mention, the muzzle brake on this rifle really works. Recoil is about the same as 308 win.




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