i just finished an EDGE for a buddy on a stiller predator, 6 groove rock barrel out of the classifieds here, and bedded in a choate varmint stock. NO MUZZLE BRAKE (he is much tougher than i am). everything went together well and i did my best to make sure everything was right. we went to the range yesterday to start the load development. all groups were three shot with h-1000, 300gr sierras and winchester or wolf primers because that is all we had on hand. i started at 92gr and went to 94 at .5 increments. every load had a click at the top of the bolt stroke and the heavier loads showed ejector swipes. most loads were consistently .650 while 93.5 was a very nice .300. i went back and loaded more with fired brass starting at 90gr and working to 92 at .5 increments. the click was still evindent on every load and most loads shot .650 with 92gr being the best at .300. all loads were with standard hornady .338 RUM dies set to give .001 shoulder setback. i think my buddy was a little dissappointed with the accuracy. i tried to explain to him that this was not BR gun and that we were just getting started. my question is this. will a switch to the CCI 250 make that much difference in accuracy? also, is there anything else to look at right now? what is the bolt clicking even with the lighter loads? this is the most consistent .650 rifle i have ever seen! groups are nice and round telling me there is not likely a mechanical issue. i think he was hoping for consistent .250 accuracy but this is no PPC. any help from people familiar with this cartridge would be much appreciated.