Buddy just bought a brand new long range in .300wm We took him out to get sighted in and the first 2 rounds went off fine and cycled good. The next two we're rough to cycle. Then I handed him my round and told him to see if it did the same with higher quality ammo. Stuck. Completely. Had to take it home and tap the bolt with a hammer. Now he cleaned it before shooting. Cleaned in between shots. Cleaned after he got home and scrubbed good. He went through his spent casings again. The original first 2 cycled great once again. His next 2 we're hard to extract. My round (hornady) wouldn't even let him close his bolt. I don't vebelieit was the round due to me shooting 50 rounds afterwards just fine. Wondering if anyone knows or thinks of what could cause this. Thanks!