Are you having much problem with accuracy in the first place. My old tube fed Ruger .44 carbine was plenty accurate with PMC ammo, shot touching clover leafs at a 100 yards from a solid rest. I would first make sure that the screws are tightened correctly from the action to the stock, then try different loads to see how they shoot. These are not designed for long distance MOA shooting, so I suggest to keep the shots between 50 and 100 yards and see how it groups from a reliable bench.
"I have no issues with people of all types being here, I do have a problem with the more extreme ends of any spectrum trying to dominate and push out moderates and opposites." Bill Plein