I have had my BM XM15 20' HBAR target for just over a year and since day 1 it has problems with my reloads.
I have been shooting 20.4 gr Hodgdon H4198 (21.0 is max) and 27.0 gr BLC(2) (27.5 gr max) with 55 gr bullets.
The bolt will unlock (most of the time, but not always) but won't travel back to eject. This only happens with my reloads, Not factory ammo.
I have phisicaly measured my brass after resizing and OAL of all loaded rounds and they are within SAMMI specs.
Another problem that I am having (I don't know if it is a seperate problem or if it is running along with the above problem). If I have to eject a live round, I can't pull the charging handle. I have to slam the butt on the bench while pulling to get the bolt to unlock. This happens with reloads or factory.
I checked the chamber for burrs and any manufacturing defects and found nothing. I haven't checked headspacing to see if the chamber is a little short (possable problem?).
If anyone can help I would apprichate it.