I just bought a Glock, S&W 1006, EAA Witness and own a STI 6" and wonder if anyone has this setup and what one brand ammo works good in all 4 for putting holes in paper. Underwood 200gr was used with the EAA and S&W. Glock is new. Doubletap is used with the STI as Underwood 200gr would flatten or back out the primer. I would like all to give 2-2 1/2" from a ramson rest. The STI has done less than 1" several times with some hand loads. I can't shoot that good any more though, old eyes.
I have half :D
So from what I gather full-power is probably out. Base on that a good next choice would be Armscor 180gr FMJ. The PPU is very accurate and affordable but not real strong.