Just last month I finally saved enough to get my 10" 500 Magnum. It shoots great with factory loads in SA. I run into a problem when I go DA with it. About 1 in 5 shots show a light primer strike. I've so far done the normal checks, screw is tight under the grip, cylinder has almost no movement, all clean under the ejector. Last weekend a friend and I ran a bunch of tests popping off primers and were able to solve the problem by putting a much longer screw in and tightening it. With that done, we were able to reliably get 5/5 in both SA and DA. TLR, I guess my main question is has anybody experienced light primer strikes with a large bore revolver? Should I insist Smith take it back and make it work without the bench fix?