I've used the factory rings with a Leupold 3.5X10X40 for maybe 4 years now. It's only a .223 but it does get bounced around in the pickup nearly every day.

I recently shot it and it was 1" left of where it should have been @ 100 yards. Could have been the rings, I don't know. They haven't loosened any in that time.

It shoots 100 yard groups in the middle .5s with my old Prairie Dog handloads. I've been meaning to work up a load for it.

Last edited by LarryfromBend; 07/11/12.