Thread: Winchester factory ammo, serious issue

My mate had some issues with Winchester last month. We sighted his new rifle with Win in April ,was doing just over 1" @ 100 yd. Than he bought a few more boxes of .308 PP 150gr, from a different batch. Groups opened up 3,4-4" @ 100 Checked scope - stock screws - bases nothing wrong. Checked ammo and was a bit surprised.

Out of 3 box:

- 21 had a full crimp
- on 8 the crimp was hardly visible, just on the edge of the case mouth
- the rest has been crimped sideways

The bullet seating depth showed 3.8 mm difference between the two extreme.
After firing some of the brass started to split at the mouth where the bloody collet weakened the material.

Tried my SST loads unfortunately his rifle doesn't like it, so he's shooting Federal now.