I have a 44 special Blackhawk. Hornady magnum cases cut to special length. Bullseye powder at 4.6 with magnum primers, 5.0 with standard primers. RCBS 44-240-swc from wws.
So I was using magnum primers and got smudges of soot on my case heads. Not all of them. Didn’t see any damage to the breech face of the gun. I switched to standard primers and still getting it but on fewer cases. Odd. I’m considering throwing out the whole batch of 450 pieces. Shame, but I don’t want to damage my gun.
I bought the brass here and it was reported as having been fired only 2-3 times. I loaded it another 2-3 as magnum. Don’t recall this with magnum loads. Trimmed it and here I am with smudges on some.
I can’t upload pics but if someone could help me, I could text a picture or email.
Post script. Both are CCI primers. Some of the pockets feel looser than others but none real loose. I never heard I’d peaking primers in low pressures rounds before.