12-22-2020, 03:11 AM
New 6.5 grendel build. 18in mlgs non adjustable gas block. To begin with I ran an A5 system H buffer had zero issues cycling factory hornady 123sst. I read where the oring under extractor was not a good thing so I removed it. Yesterday I ran across some factory 90gr nosler varmageddon loads they would not cycle at all. The spent cases stayed in the chamber. I reloaded some test loads with a 95gr vmax with 28.5-30gr of benchmark. The lower dose cycled fine but the bolt would not lock back, and the next charges wouldnt cycle. Today I put the oring back on extractor and went with a standard carbine buffer. Ran the same test with reloads this time they all cycled and the bolt locked back on the last rounds except for the factory noslers they cycled but bolt does not lock back. Ejection pattern is between 3 and 4 with all rounds factory and reloads. Is my rifle over gassed or under ? What do I need to do ? Would love for a genius to guide me through this thanks