That's what I did, maybe a few more rounds on top of that. I'd recommend check the ejector halfway through the 300 if you are going to do it in one sitting. Wait til the barrel cools down and also check gas block to see it came loose (barrel too-but no issue as of yet) plus the rest of the rifle's screws. Since i tightened the GB w/o loctite, it's remained tight. Come to think of it, you might want to veryfy that ethe ejector, GB, and barrel are snug before shooting. Mine might have been loose before I shot it the first time.