So my buddy and "I were shooting his new 416 Rigby in a CZ 550. We started with Hornady DGX & DGS. Both shot about 1.5" @ 100yds. Then we went to his reloads. Nosler 400gr with RL22 and "IMR 4350. 2 powder weights of each. Loads were well within spec and popular loads. Had a hard time keeping them to 3". Then the last was Federal with the 400 gr. A frame. 3 shots over lapping. Any suggestions other than shoot factory A frames at a criminal price. I have a 416 Rem. and it shoots most everything very well!