Originally Posted By: kwg020Originally Posted By: HidalgoMy 1/8 barrels shoot 60s extremely well, so I can't imagine why your 1/9 wouldn't do the same with 53s if you find the right powder for it.
Benchmark has been my "go to" powder for a long time. I have loaded a touch past max in my ARs with the 60s without any signs of pressure problems.
Hodgdon is showing a max load of Benchmark (26.0gr)with the 53 running out at 3308 fps, and the ballistics on the Superformance factory loads is proposed to be 3465 fps. That's a considerable bit of difference, but I doubt it would be noticeable on either end of the bullet.
Might be a good place to start ......
That's 3465 out of a test barrel? If you don't have the same test barrel, how would you ever get their numbers? Do we know what the test barrel is?
kwg
I typically get 3,550-ish with 53gr bullets and Benchmark and IMR 8208, and Lapua cases in a New Haven M-70 HBV.
"Superformance" is not the only fast powder around..