9 mm Luger JHP

unspellable · 08-10-2007, 09:08 AM

Pressure curves have absolutely nothing to do with the functioning. (We worry about pressure curves with a blow back action, not a recoil operated action such as the Luger.) The parameter of interest is impulse. A 147 grain bullet at 300 m/s has an impulse equal to that of a 124 grain bullet at 1167 ft/s, The famous Winchester white box load we all know and love drives a 124 grain bullet at 1140 fp/s so it's not unreasonable. The 147 grain loading has enjoyed some limited popularity here in the US.

The problem will be feeding. Forget the ramp and consider the magazine. If the edge of the hollow in the bullet drags on the front wall of the magazine there will be problems. Once on the ramp the edge may hang on the upper side of the chamber but it's more common for lead bullets to cause a problem here.

08-10-2007, 09:08 AM	#3
unspellable User Join Date: Jun 2002 Location: Iowa Posts: 769 Thanks: 0 Thanked 20 Times in 12 Posts	Pressure curves have absolutely nothing to do with the functioning. (We worry about pressure curves with a blow back action, not a recoil operated action such as the Luger.) The parameter of interest is impulse. A 147 grain bullet at 300 m/s has an impulse equal to that of a 124 grain bullet at 1167 ft/s, The famous Winchester white box load we all know and love drives a 124 grain bullet at 1140 fp/s so it's not unreasonable. The 147 grain loading has enjoyed some limited popularity here in the US. The problem will be feeding. Forget the ramp and consider the magazine. If the edge of the hollow in the bullet drags on the front wall of the magazine there will be problems. Once on the ramp the edge may hang on the upper side of the chamber but it's more common for lead bullets to cause a problem here.