Check that the disconnector/interrupter thingy on the upper side of the receiver is in place, above the bolt. It controls the mag feed, allowing the next round to be pushed forward when the bolt cycles. It's easy to miss when reassembling the action, and I suppose it could get broken if force was used. The little part runs in the slideway on the top of the bolt.
Check over the bent wire spring that the cartridge rests against at the front of the mag tube, as well. I have polished the ends of a couple of them, using a Dremel and the rubber Cratex type wheel and a buffer. It seemed to help.
Put a radius, or at least break the edge on the chamber, where the round slides as it is pushed forward when feeding. Last one I did, I did with a cheapo electric fish hook sharpener, and it worked very much better. Without the radius, it was either shaving off great bloody chunks of each bullet, or just hanging up . Not your problem, but a heads-up.
I replaced an extractor with a Browning one. One of the two hooks broke off after maybe 15 bricks of ammo went through it. We'll see how that works out.
It fit fine, and the $20 it cost me, saved me from having to make one.
Cheers
Trev
