Redding Re-sizing issues?

[rumlover]

OK, so while I was waiting on the small base dies, I took some trimmed, re-sized cases, put them in the chamber, and let the BCG fly. Almost all extracted. Those that extracted easily were then loaded and taken to the range this afternoon.

The rifle cycled fine for the first 6 rounds, the last 5, not so much. When I cleared the chamber, I noticed a lot of brown soot on the YHM handguard. As I inspected further, there was a lot of oil on the barrel around the gas block and the gas block was no longer seated in the same place. It had moved forward about 1/16".

SO.... It appears the problem is 2 fold. First, the cycling issue is probably a combination of a misaligned or improperly fitted/pinned gas block and the extra pressure needed to extract regularly sized brass. Second, the chambering issue seemed to go away once I sized the brass by allowing the BCG to fall on the empty brass (only talking about 0.001-0.003" at the base). This will likely go away with the small base dies. If it doesn't, then I'll look for the die dimensions on newer 300/221, 300 Whisper, 300 Fireball, or 300 BLK offerings and compare it to freshly fired brass dimensions.

Thoughts?