I am not sure if this post belongs here or in the "Magazine" forum; but since I do not know what the problem is I will start here.
During my second range session with my new 458 I have noticed a consistent problem - the bolt is frequently failing to completely chamber a round after picking it up from the magazine. The round will start to chamber and then hang up, canted. If I drop the mag an inch or so and pull the charging handle and release - the round chambers fine. This does not happen every time; once the rifle warms up it happens less frequently and it seem more common at the top of the magazine.
For those of you who may have advice, here are the particulars:
1. This is a RRA rifle with the heavier "green" buffer spring installed for 458, although I had the same problem with the standard spring.
2. I have tried 2 different loads with 2 different bullets and 2 different mags with consistent results. (COL 2.10")
3. I checked to make sure the mag is seated well; no visible marks on the brass indicating a problem in the chamber and the rifle is accurate.
I appreciate whatever help you have to offer.