Problem Chambering 7.62x51mm Full Resized Lake City (LC 11) brass ?

[lshel]

I have been working up a load for M&P10 using onced fired LC 11 full length resized brass with 168g SMK bullets. 4-5 rounds out of 16 did not chamber completely and when pulled trigger, hammer would fall but no bang. I had to use wooden handle to push against charging handle to extract shell. These cases had no primer intention. I marked rounds to check dimensions if someone could give me and idea besides COA and brass length to check. I don't havea 308 cartridge case gage. Previous reloads chambered and fired and also new factory ammunition chambered and fired okay.

 

Any suggestions as to what may be the problem. Thanks

[Caster]

You may need a small base die or you may need to grind a small bi off the top of your shell holder to get the brass in the die a little further. A case gauge would be helpful.

[Westwindmike]

I'd check case length too. May need trimming.