Clark
Member
Quickload errors in elevated pressures in 7.62x25mm Tokarev
I did some overload experimenting with a Polish Tokarev today:
5) "AA loading guide #2" 2000, 8.5 gr AA#5, 86 gr FMJ, 1.316", 1717 fps, Starline brass, CCI500, 41.5 kcup, ok in CZ52
a) 10.5 gr AA#5, 86 gr .54" S&B pull FMJ, 1.316", Starline brass, wsp, ok in Polish Tokarev
b) 11.5 gr AA#5, 86 gr .54" S&B pull FMJ, 1.316", ex groove +.005", primer fell out, Quickload 93 kpsi
c) 11.5 gr Power Pistol, 86 gr .54" S&B pull FMJ, 1.316", ok in Polish Tokarev, beats AA#5 in recoil, Quickload 107 kspi
What Quickload admits is that the program cannot predict straight wall cases. Too much powder may go out of the barrel unburned and Quickload assumes worst case. But today I compared the limits of brass with a bottle necked cartridge.
The error Quickload makes is thinking 11.5 gr of Power Pistol is higher pressure than 11.5 gr of AA#5. The AA#5 load causes the extractor groove cut to expand .005" and the primer falls out. The Power Pistol 11.5 gr load does not cause any extractor groove expansion that I can measure with my dial calipers.
So here is a bottle necked cartridge that Quickload gets wrong.
What can Quickload get right?
When using rifle powders in rimless cased .223 or 8x57, Quickload usually predicts ~65 kpsi when the bolt gets sticky and the primer pocket gets loose.
I did some overload experimenting with a Polish Tokarev today:
5) "AA loading guide #2" 2000, 8.5 gr AA#5, 86 gr FMJ, 1.316", 1717 fps, Starline brass, CCI500, 41.5 kcup, ok in CZ52
a) 10.5 gr AA#5, 86 gr .54" S&B pull FMJ, 1.316", Starline brass, wsp, ok in Polish Tokarev
b) 11.5 gr AA#5, 86 gr .54" S&B pull FMJ, 1.316", ex groove +.005", primer fell out, Quickload 93 kpsi
c) 11.5 gr Power Pistol, 86 gr .54" S&B pull FMJ, 1.316", ok in Polish Tokarev, beats AA#5 in recoil, Quickload 107 kspi
What Quickload admits is that the program cannot predict straight wall cases. Too much powder may go out of the barrel unburned and Quickload assumes worst case. But today I compared the limits of brass with a bottle necked cartridge.
The error Quickload makes is thinking 11.5 gr of Power Pistol is higher pressure than 11.5 gr of AA#5. The AA#5 load causes the extractor groove cut to expand .005" and the primer falls out. The Power Pistol 11.5 gr load does not cause any extractor groove expansion that I can measure with my dial calipers.
So here is a bottle necked cartridge that Quickload gets wrong.
What can Quickload get right?
When using rifle powders in rimless cased .223 or 8x57, Quickload usually predicts ~65 kpsi when the bolt gets sticky and the primer pocket gets loose.
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