Mine uses .575 on 65gns but I still have to size them down just a hair. If not they are thumb pressure to get in the muzzle but ram smooth. Get a measurement on your bore. Barrels do vary. A .578 won't even start in mine without more or less pounding it in.Im going to try some mini balls
Mini should be at -.001 of bore.Have to pound it to start it but goes down good after. The tighter it is the tighter the group
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