I do know a number of things come into play. I never had the time these past weekend too shoot to see what was gone on. I did look on net about bullet flight and still need to read up some more. I loaded up some hotter thinking this might be it but maybe not who know's. I even loaded up some with some imr 4227 and i'll try these too never know until i shoot them. It's not like I'm shooting a 44 with thousands of info on loads these is a 500 mag. P/C 10 1/2" barrel and i'll just have to put the time in and the $ and time will tell. Boy my 41 was a lot easier to sight in. Thanks again for ya'll time and wish me luck i think i'm gonna need it on this gun.