Neighbor had a 270 wsm that jammed. I looked it over to help him fix it. This is what I found, slow cycling it:
Last round didn't have enough spring tension.
When you racked the bolt home slowly, the rebated rim was barely touching the bolt face.
As the bolt continued forward, the cartridge began its way up the feed ramp.
As the sharp cartridge shoulder hit the feed ramp, the angle was too steep and the bolt face would slip right over the rebated rim.
I stretched out the follower spring and all was well.
No thanks to a fat, short action cartridge with a rebated rim.
