Originally Posted by Greyfox
I agree with the prior posts about using a small base dye. I would try this before you change too many variables on your rifle. Tight fitting brass can give the impression that the rifle needs to be constantly lubed to function properly. What could be happening is that the combination of fouling and heat is causing the case to be too tight requiring more force to chamber/eject the round as more rounds are fired. By lubing the action you are compensating for this but not solving the real issue. I had the same problem with mine, and small base dyes solved the problem. I'm not sure that this is your problem, but it's the first place I would go based on your symptoms. When troubleshooting an AR, assuming nothing is broken, it's wise to start with the basic variables first:
Gas system clear
I am not having live ammo feeding problems. Small base dies are not going to help with brass extraction, as no matter how small You under size brass it will expand to the chamber!.
I am no expert though, so it could be, have a set of RCBS AR small base dies on order.
Along with 125 Nosler BT's.
Anyone know how the action gas system does with 125 gr bullets vs 168's, or light bullets more powder vs heavy bullets less powder?
thanks for the help. Again