So, I’m bumping this thread because I’ve had inconsistent feeding with my 350 legend in an AR. I am very familiar with ARs and have been shooting and building them for years. It seems that some 350 rounds just do not feed well. So far I’ve tried the following: Winchester defender 160gr, Hornady 165ftx, fort Scott munitions TUI 125gr copper, and Hornady American whitetail 170gr.
I am not discussing their internal or external ballistics in this post, just their reliability during cycling. Of these four, Winchester defender and the 165ftx feed most reliably. Although I’d still estimate about 10-20% failure to feed or seat fully into battery. I did notice a good bit of unusual markings on most cartridges after feeding then ejecting. I have ruled out issues with over/under gassing. I have tried different magazines (dura mag and Winchester) with consistent feeding issues with both. The barrels I use DO NOT have M4 feed ramps which are known to have feeding issues with 350 legend. They have the wide open feed ramps.
My best guess is that it is a result from multiple issues compounding. For example, heavier cartridge weight, interference with feed lips or front of magazine, bullet shape, not using a ton of line on BCG.
Anyone had similar issues and found a solution or tricks to get them to run more reliably?