I was using 11.2gr AA7 under a 125 Zero FP. I had settled on this load after chrono and group testing. It was very consistent, low SD, great accuracy. However, there was a fair amount of particles left in the gun after a few hundred rounds. This past weekend, I had a failure to extract in my M&P357 towards the end of a SC match. I think the culprit was these particles fouling the already relatively snug chamber and causing the case to stick. But for that stupid FTE, I would have finished fairly well, darnit. Previously, I had been using 8.8 gr longshot, and never had the FTE issue pop up. That brings up a couple questions that I was hoping the collective wisdom here might be able answer:
1. Does this theory make sense?
2. Has anyone else had issues with AA7 leaving a lot of particulate matter in the gun? (in 357 sig or otherwise)
3. If so, is it a symptom of too little/too much pressure for AA7 to burn cleanly?
1. Does this theory make sense?
2. Has anyone else had issues with AA7 leaving a lot of particulate matter in the gun? (in 357 sig or otherwise)
3. If so, is it a symptom of too little/too much pressure for AA7 to burn cleanly?
