I buy most of my ammo in bulk and put 1000 rounds of Magtech 158 Gr. SJSP through my GP since my last post without any problems. My new order of PMC .158 Gr SJSP came in and wouldn't rotate again.
I've been following similar threads about this on a couple of other websites and called Ruger. The Rep that I spoke to on the phone said that they were aware of the problem and sent me a UPS slip to send the gun in for repair.
9 or 10 days later it was returned with a kind of generic "Cylinder Repair" on the ticket. I took it out to the range on Saturday and put 150 rounds of Fiocchi, PMC and Magtech through it and she works smooth as silk.
Ruger really couldn't have been easier to work with on this and I'm a happy customer!
If anyone is having the binding problem with a newer GP, I'd give them a call.