Hey hylander
My question would be, to what end are you working for? If cloverleaf groups in paper is the goal, lower velocity and much tighter loading techniques could be the answer. In Lawnsteel play there are several GP100s being employed with success, so they can shoot. With only a couple exceptions, all Rugers being brought out to play Lawnsteel, are capable of pinpoint accuracy. By that, I mean hitting targets of less than four square inches with a cast projectile at a range of seventy yards out with stock "Iron sights". We have had "Ruger only tournaments" complete with Ruger sponsored awards.
Attachment 115806 It is common for us to expect this type of accuracy from our Rugers. So my advice in your quest for accuracy may be to load down rather than up. Keep us posted.
Roy