I'm trying to find the correct size bullet and patch for my rifle. I talked to BACO and was told a .441 bullet with two wraps of 9# onionskin paper would work. That came out to .4455. I slugged my barrel, it came out to .4575 with a bore of .4485. I just tried the recommended bullet and had better patterns with my shotgun. I would like to shoot bore diameter but I not sure if going over the bore or staying under is the way to go. Any thoughts and advice would be greatly appreciated.