Quoted: OK,
I went to the range today and took the HK94. I fired 50 rounds, mostly Winchester white box and handloads of 5.5 gr. Unique behind 124 gr Remington HP's and I tried 5 rounds of Hirtenberger +P+.
I was able to catch 2 of the +P+ cases and after inspection, I saw no sign of over pressure (flatened or pierced primers). The cases appeared to be normal. I brought them home and put them on the scale, they weighed in at 58.0 and 58.1 gr so the brass was heavier than all of the other cases I had weighed (again, limited sample).
So what's the deal? No signs of over or high pressure on the +P+ cases. If this stuff is unsafe on a closed bolt rifle, what would the signs be? The recoil did seem to be a bit sharper but that's a subjective call, it may have been me just wanting it to show some pressure signs. It would be interesting to do a blind test.
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I've been chasing this dog for a couple of days now and here's what I 've found thanks to frfrogspad.com
Approximate Velocities:
Standard Load, +P Load, +P+ Load (Not SAAMI), Proof Pressure
9 mm 115 gr 1220 FPS @35,700 PSI 1280FPS @38,500 PSI 1335 FPS @42,000 PSI 52-55,000 PSI
9 mm 125 gr 1140 FPS @35,700 PSI 1180FPS @38,500 PSI 1250 FPS @42,000 PSI 52-55,000 PSI
Pressure data per SAAMI
So, to answer my questions, you do get more velosity along with an increase in pressure but looking at the velosity gains vs the pressure increases, it hardly seems worth the effort or the wear and tear on your firearm to shoot the +P+ ammo.