I have a Model 112 with a factory 223 barrel that was rechambered to 223 AI. It's a solid .5 MOA barrel shooting 69gr SMK. The load I worked up for it is 27.2gr of H4895 at 3250fps. At 27.5gr the groups were a hair smaller but I started getting pressure signs.

When I say pressure, it was a little different than what I'm used to seeing. Bolt lift was not any harder than the lower loads, but extraction was hard. I actually had to tap on the bolt handle to get the bolt to come to the rear. Is this a normal sign of excessive pressure? I'm happy with the load I have, just wondering if anyone else has seen this. The action is not timed or trued and the barrel is 26" so I assume the reamer was just ran in far enough to 'clean up' the standard chamber.

Jason