You might want to try some .535 balls I`ve gone to them this year in my 54 cal .useing pillow ticking patches I buy by the yard at Walley world and cut and lube myself ..pillow ticking thickness varies a bit what I`m getting runs between .020 and .018 thick . The .535 balls really tightened my groups though . I found the balls at Sportsmans warehouse and tried them before I ordered a mold to cast my own .
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