Ridgerunner, I have a 3 1/4" 500 nitro on a ruger #1 also. Mine has a long 28" barrel. I have pushed 570 grain bullets to 2365 ft/sec with it and have had no problems with it at all over the past 3 years. If you can handle the recoil, the gun can handle the load. I would not shoot these loads out of any 500 other than a ruger #1. Stars and Stripes ammunition in Florida loaded up the ammo for me.