ded_i 308, you don't state how many rounds you
are putting into the mag, but it sounds like you
are "forcing" the 10th round in.
Try only putting 9 in the mag, yes I know they
are supposed to be 10 rounders, and you can get
10 into it, but as I indicated above (and you
most likely are familiar with also) the 10th
round has to be forced into the mag and as such
puts more tension on the bolt as it attempts to
close on the 1st round.
As far as you having the problem of the magazine
going in too far. Let me as you a question, when
you push the magazine release to "dump" the mag,
does it freely fall from the weapon? Or does it
just stay in the weapon and not move?
..keep your powder dry!..