I have recently acquired a Savage ML-II. I mounted a Leupold VX-I 2-7x33, got some MMP HPH orange, HPH Green, and HPH black sabots, cast 300g .429 bullets and 340g. .458 bullets. I also bought some 240g .430 Hornady xtp pistol pullets to try just in case. AA 5744, and IMR 4759 powders were used.

Using the load data supplied with the rifle and the load data from Doug's message board, I started to work.
No matter which bullet/powder combination I used, I could get no better than a 6" group at 100 yards. So, I remounted the scope, no difference. I changed the scope for one I knew was good. No difference. My question is, what else could it be? I cleaned the gun multiple times. The action screws were tight. The scope mounts and rings were tight.

Any help would be appreciated.