elkaholic
Well-Known Member
Ok thx. What is the length of your fire formed cases?
My 338 Sherman Shortmag
- Thread starter ruby76
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ruby76
Well-Known Member
Avg 1.935
elkaholic
Well-Known Member
Great! Chamber is 1.940
waspocrew
Well-Known Member
Awesome! Looking forward to your results!
ruby76
Well-Known Member
I now have a couple dozen mild fireforming rounds through with 200 accubonds, 59 grains of RL22 (had laying around).
Now on to the fun stuff. I'll be loading RL17 and superformance with the 250 bergers to find my max. Using the 300SS thread as a reference I'll start with about 56 grains of RL17 and go from there. With the superformance the starting charge appears to be a bit more.
I have a magnetospeed for all shots.
Now on to the fun stuff. I'll be loading RL17 and superformance with the 250 bergers to find my max. Using the 300SS thread as a reference I'll start with about 56 grains of RL17 and go from there. With the superformance the starting charge appears to be a bit more.
I have a magnetospeed for all shots.
elkaholic
Well-Known Member
Pretty sure you will max around 62 grains of RL 17 with the 250's and I'm not sure you will be able to pressure out with Superformance, but maybe? I think H100v may fall short because it isn't quite as dense as RL 17 and you need a couple more grains.
I'm guessing you will hit 2800 between 61-62 grains of RL17??
Take it cool though!
I'm guessing you will hit 2800 between 61-62 grains of RL17??
Take it cool though!
ruby76
Well-Known Member
elkaholic
Well-Known Member
Nice. That's a nasty looking little package. Wish I had one
ruby76
Well-Known Member
Initial results are in. Prior to these tests I have only 24 rounds through this barrel for break-in. I used R-P stamped brass formed and prepped by me, Federal 215 primers and RL17 for all shots below. I'll have to re-do these tests as I was having some issues with my magnetospeed.
59 grains read 2694 fps
60 - 2722
61 - 2745
I can say however that at 60 grains I could see an extremely faint extractor mark, 61 was more visible and slight primer cratering. My 62 grain shot had slighly more of an extractor mark (not even shiny and highly visible), same slight cratering but did not register speed. I'll load again at half grain increments starting at 58 grains and go from there. I'll be testing superformace next.
59 grains read 2694 fps
60 - 2722
61 - 2745
I can say however that at 60 grains I could see an extremely faint extractor mark, 61 was more visible and slight primer cratering. My 62 grain shot had slighly more of an extractor mark (not even shiny and highly visible), same slight cratering but did not register speed. I'll load again at half grain increments starting at 58 grains and go from there. I'll be testing superformace next.
elkaholic
Well-Known Member
The Norma brass gets early extractor marks too. It may be tougher than R P though?
ruby76
Well-Known Member
I'll push it some more next round, loaded up to 63.
elkaholic
Well-Known Member
Ya, the RP brass is a bit of unknown to me? Sure wish I could ship my ADG up there!
ruby76
Well-Known Member
Me too! There is a way, I picked up one of Nathan's brakes while I was in the states recenly. I'm finding the recoil to be a non issue though, but I'm sure it will make its way on to my rifle.
elkaholic
Well-Known Member
Nice! That will turn it in to a pussycat
