Alright, I got a bell curve out of it. I was still getting a cliff even with the hammer spring backed out as far as possible. So this is with 3/16" porting, hammer spring shim removed, and 4 turns on the hammer spring. This is with JSB 25.39 Kings, 3000-2400 psi, 165CC tank. That puts me at an efficiency of 1.08, which is .02 less than out of the box. Not bad for a considerable fpe increase via porting.
887
889
890
896
892
894
893
891
893
890
That's 10 shots (one magazine) with less than 1% spread. I need to shoot a longer shot string to see how many shots I get before it drops off. I have a Huma reg showing up today and I'm going to have to decide to regulate the gun or not, depending on the results of a 20 shot string. I had originally bought the reg to make a hyper-efficient 12 fpe Flash, but maybe it will be good in this rifle. It is the .25 regulator.