Happened again today.
At the starting load of 11.2 gr, No. 9. Fired 18 rounds. The 16th round locked the action. Primer flowed into firing pin hole (hammer nose). Rounds 17 & 18 blanked the primers. Bottom left 3.
Same components used.
Brass seem to show a mark from the recoil shield . All brass extracted normal.
Needs a complete investigation, clean and fire with 13.0grs 2400, for starters.
View attachment 1079169 View attachment 1079170
Accurate 9 has a faster recoil impulse than 2400 so 2400 should be a little easier on the brass than AA9, may not show up as profound as AA9 problem is.
I'm wondering about the looks of the hammer nose dents on the brass. It may be lighting conditions but some of the dents look deeper than other.
Powder not burn consistantly? Has your hammer nose been tuned in to the gun after it was staked on the hammer.
When mine was replaced we had to work it down a little because the pin was a little to long when it was new. It would pierce a primer now and then and with the harsher recoil of some powders and loads.
I also noticed that the dents are everywhere from center of primer to off to the side of primer and I don't remember either one of my 28s ever doing that.
The strikes were dead center of the primers. I may just not be remembering correctly.
I'm not in a position to test my guns for that because I'm laid up right now. Trying to go from memory. The dents don't look round either.
Are these things just lighting conditions or am I seeing an accurate view of the case heads?
Not really sure what to think of the primers that look deeper than others. I would also lean toward the powder not burning consistently on that one to start with but if the hammer nose is striking off sides of the bushing it also could be inconsistent with the strikes. Any side to side movement of the hammer?
Just trying to wrap my head around this. Definitely try the 2400 though and see what shakes out of that.