.2925 Fired Case Neck Measurement

[LRRPF52]

The Grendel chamber has a compound throat angle to deal with a wide variety of bullet shapes and seating depths. If the ogive of the PPU MPT is jammed into a .264 LBC chamber ( a chamber that PPU didn't have when doing the load development for their ammunition), then that could lead to over-pressure. There also was an earlier lot of 120gr MPT that seemed to be pretty hot in people's Grendels, so there are more possible factors in this case.

Easy answer is stick to Hornady, but not the most affordable one either.