badkarmamib
Member
I have loaded over 1K of these before:
.40S&W 180gr lead FP, 18 Brinell, lubed
4.7gr HP-38
1.115 OAL
S&W M&P FS
Today, after the first couple of mags, I had three-point jams every other round. I finished the mag, and ran a bronze brush down the bore. I got one more mag to run, then it started acting up. I checked the dirty chamber, and it wouldn't pass a plunk test. Two passes with the brush, and it passed. I had gum on the breech face, at the edges and around the extractor. This was harder to get clean than the chamber. Would run another full mag, and then it would act up until I cleaned it. Didn't matter which mag I used.
So, is the build-up likely lead, powder residue, or a mixture? Am I not sealing the chamber with such a light charge, and I should increase it? Would a different powder solve the problem easier? Thanks for any input.
.40S&W 180gr lead FP, 18 Brinell, lubed
4.7gr HP-38
1.115 OAL
S&W M&P FS
Today, after the first couple of mags, I had three-point jams every other round. I finished the mag, and ran a bronze brush down the bore. I got one more mag to run, then it started acting up. I checked the dirty chamber, and it wouldn't pass a plunk test. Two passes with the brush, and it passed. I had gum on the breech face, at the edges and around the extractor. This was harder to get clean than the chamber. Would run another full mag, and then it would act up until I cleaned it. Didn't matter which mag I used.
So, is the build-up likely lead, powder residue, or a mixture? Am I not sealing the chamber with such a light charge, and I should increase it? Would a different powder solve the problem easier? Thanks for any input.