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Hadn't thought running supers would assist, sounds like a cost effective way to resolve the issue if that works. Otherwise I have to find a buyer for 990 rounds of my 200gr haha
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If you've only run 10rd of subs through the new gun and nothing else that's likely your issue.
Buy a few boxes of "cheap" supers to run though it and oil it up, then try the subs again.
Subs can also be more mag-sensitive than supers due to bullet shape, what mags are you using?
I've had zero issues with 300blk PMAGs.
Okay/Brownells aluminum mags worked fine for me with supers and most of the time with subs, but not always.
Subs would bind enough in the mag to slow down the elevation, and the MCX cycle is faster than a typical AR.
Have with tried one round in the mag to see if it locks back on empty upon firing?
If it does, it's likely a mag feed issue and not an ammo issue.