mgann,
If the PMC leads your barrel too much, why not try some different ammo?
With all the different brands and types of 22 RF ammo around there has to be one that will shoot as good as the PMC and not lead the barrel.
Best,
TnNuc
PS: Try some Wolfe Match ammo. It's not very expensive, and I've seen it shoot as well as some of the $10/box stuff. :wink: