Fabs,
I'd clean the heck out it, check for obvious damage to the extractor and other moving parts and go back to the range and use ammo that you used before with out problems. It sounds as though your new ammo is your problem, IMO, either it's causing the gunking, to light a load or a combo of these factors. If you haven't had problems with other ammo and this problem just arose ...
Good luck, definitely don't want a jam in the crunch.
Mil Dot
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