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OK,
Back from the range.
I trimmed 10 of the CorBon empties (lake City brass) and 15 of Mr. Davis's brass to a length of 1.345". All were resized once more for good measure and loaded with Sierra 220gr MK over 10.1 grains of H110.
The good news is that everything fed beautifully. I was impressed with the smoothness. I really think that I have solved this issue finally.
The bad news is that this upper (my buddies) would not cycle completely. I'm back to the same issue where it won't strip the next round. I had this same problem with the first two barrels I bought, and I finally had to move the gas block back to correct it. The first of these replacement barrels (my upper) cycled perfect right out of the box this time around. This means that 3 out of 4 M1S barrels will not quite cycle. Before I put my foot in my mouth on this issue, I will play with the upper a bit more.
So problem one is finally solved. From now on I will trim all my brass to 1.345. I think it is strange to have a cartridge with so many listed trim lengths but I know this works and I won;t be looking back.
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