BFD
Hammer Time Executive member
Muddy was right. This stuff is great. Here’s why I think this:
The long & short of it!
Out of the box the brass comes 12 thou longer than typical 300WM brass. After firing today I measured only a .003” stretch of the shoulder. This is typically 18 thou on brass shot to date. For what I do, this means no changing powder charge weight after a fireforming!
Reg brass:
Pete Long:
Peterson brass has less case capacity by about 2gr H2O measurement. Knowing this, I reduced my known charges in 4x fired brass by 1.5-2gr to start load development.
The out the gate testing results were promising. Shooting 215 Bergers here (Don’t hate
it’s just for 1000-1500yd steel ringing) Did a bullet jump test and tried a half grain heavier charge:
Surprisingly the deepest seated bullet of 3.850 with .030 jump, and longest seated bullet 3.880 (At the lands) showed .0005 larger primer pockets than .860 & .870. Oh boy that 78.5gr load! 2SD of sample size 4 rounds is nothing really, but for this test, it’s a stark indicator things going right there. Next batch 78.5gr @ 3.870!
Analysis of the primer pocket sizes, fired shoulder length, and web growth above belt, I did not find any over pressure signs. I did, however, see some belling of the primers after decapped. In reference to the “Reading Pressure Signs” sticky that flaring at the top of primer is a pressure sign.
This didn’t make sense to me. I have belled/flared primers, but no other”bad” pressure signs. Got me to examine the brass a little deeper.
The primers sit under the case head, but proud and unsupported at the top. These were seated with regard to depth in the pocket. So, I think this is why I’m getting a false read here on pressure considering the primer flare of over pressure rounds.
Ambient temp was 8F with -10 windchill. I kept the rounds about 100F in pockets of my bibs and single fed each round as to maximize retained powder heat. Bench was frozen over and the ski feet of the bipod were actually ski feet today!
The long & short of it!
Out of the box the brass comes 12 thou longer than typical 300WM brass. After firing today I measured only a .003” stretch of the shoulder. This is typically 18 thou on brass shot to date. For what I do, this means no changing powder charge weight after a fireforming!
Reg brass:
Pete Long:
Peterson brass has less case capacity by about 2gr H2O measurement. Knowing this, I reduced my known charges in 4x fired brass by 1.5-2gr to start load development.
The out the gate testing results were promising. Shooting 215 Bergers here (Don’t hate
it’s just for 1000-1500yd steel ringing) Did a bullet jump test and tried a half grain heavier charge:Surprisingly the deepest seated bullet of 3.850 with .030 jump, and longest seated bullet 3.880 (At the lands) showed .0005 larger primer pockets than .860 & .870. Oh boy that 78.5gr load! 2SD of sample size 4 rounds is nothing really, but for this test, it’s a stark indicator things going right there. Next batch 78.5gr @ 3.870!
Analysis of the primer pocket sizes, fired shoulder length, and web growth above belt, I did not find any over pressure signs. I did, however, see some belling of the primers after decapped. In reference to the “Reading Pressure Signs” sticky that flaring at the top of primer is a pressure sign.
This didn’t make sense to me. I have belled/flared primers, but no other”bad” pressure signs. Got me to examine the brass a little deeper.
The primers sit under the case head, but proud and unsupported at the top. These were seated with regard to depth in the pocket. So, I think this is why I’m getting a false read here on pressure considering the primer flare of over pressure rounds.
Ambient temp was 8F with -10 windchill. I kept the rounds about 100F in pockets of my bibs and single fed each round as to maximize retained powder heat. Bench was frozen over and the ski feet of the bipod were actually ski feet today!
)
, I'm sorta kinda glad you stuck around 
That was a nice breakdown on the brass.
