.40 S&W for the noob - Page 2

Kennydale · October 27, 2013, 05:28 AM

Thanks for all info (Somewhat of an information overload for this newbie). It gives me better insight as to what the different pressures do.

WWWJD · October 29, 2013, 10:32 PM

Been out of town for a few days. Thanks for all the feedback guys.

totalloser · November 4, 2013, 10:06 PM

Assuming that the lead on a test from firing a weapon is from lead vapor from heat is bad science. Some very basic research will tell you that primers contain a lead oxide compound. I am skeptical that the pressure/heat duration is anywhere near the levels needed to penetrate the metal to melt it let alone bring it to vapor temperatures.

This test probably found oxides of lead from the lead styphnate of the primers. A hazard well known in reloading. Elemental lead is fairly difficult to absorb. I think if the temperature penetration were adequate to vaporize lead, your barrel would anneal after the first shot. :P

Having said that, lead bullets can be problematic in .40 for a handful of reasons. Many .40's are polygonal rifled, and of those, some have a much less than ideal interchange geometry for the fired projectile which leads up the barrel.

October 29, 2013, 10:32 PM	#27
WWWJD Senior Member Join Date: February 9, 2011 Location: Central KY Posts: 552	Been out of town for a few days. Thanks for all the feedback guys. __________________ *~Mark* NRA Endowment FTW

November 4, 2013, 10:06 PM	#28
totalloser Senior Member Join Date: October 19, 2007 Location: Fort Bragg, CA Posts: 679	Assuming that the lead on a test from firing a weapon is from lead vapor from heat is bad science. Some very basic research will tell you that primers contain a lead oxide compound. I am skeptical that the pressure/heat duration is anywhere near the levels needed to penetrate the metal to melt it let alone bring it to vapor temperatures. This test probably found oxides of lead from the lead styphnate of the primers. A hazard well known in reloading. Elemental lead is fairly difficult to absorb. I think if the temperature penetration were adequate to vaporize lead, your barrel would anneal after the first shot. :P Having said that, lead bullets can be problematic in .40 for a handful of reasons. Many .40's are polygonal rifled, and of those, some have a much less than ideal interchange geometry for the fired projectile which leads up the barrel. __________________ You only truly believe in freedom if you believe in the freedom of those you disagree.

October 27, 2013, 05:28 AM	#26
Kennydale Member Join Date: April 16, 2013 Location: Richmond/Rosenberg, TX Posts: 50	Thanks for all info (Somewhat of an information overload for this newbie). It gives me better insight as to what the different pressures do.