I have a pair of 15-22 Performance Centers. They will both put a dozen 60gr Aguila SSS rounds inside a nickle at 25 yards (with some keyhole-ing). I can screw on my 9mm can (9mm because bullet not stabilized) and the gun is silent, except for the sound/flash/smoke coming out the bolt - caused buy the huge increase in momentum from the 60gr bullet.
I'm hoping to get a much heavier JP bolt return spring so the bolt doesn't open prematurely. I realize the twist won't stabilize the pill, but I don't really care as it's so accurate and deadly at 25 yards (and out to 50 yards).
I can't find where to order a JP Enterprises bolt return Spring for my 15-22?
Originally my plan was to install a 1:9 twist barrel one of my ruger 10/22's - but the 10-22 won't feed the 60gr SSS and my 15-22 feed them reliably.
These threads mention the JP springs: