You may also need thicker patches. I use pillow ticking that I buy in Walmart by the yard. I cut it in about 1.25" strips (3 lines) and then either cut at the muzzle or cut the strips into squares. Anther thing that will improve accuracy is the type of lube. Don't overlook it. My .58s shoot really well using olive oil as a patch lube while one of my 45s like a paste type lube. Bore Butter from tc is decent patch lube also.