Problems with Wolf Ammo

[Captk]

I went shooting this morning with the 6.5. I started with Wolf ammo and loaded 5 rounds into the mag. All 5 shot with no issues. I then put 3 rnds in the mag, all 3 fired no problems. I put 5 rounds in the mag and had 2 FTE. The cases were getting stuck in the chamber. I shot another 15 rounds including a few Hornady. Almost all of the cases got stuck in the chamber including all of the Hornady I tried. At this point I feel the problem is a tight chamber that when it gets warm it tightens up causing the cases to stick, of course I can also be completely off base. Any suggestions?

Now how do I resolve the problem?

Thanks, Ken