It's a conundrum.....people buy a military rifled-musket reproduction to shoot "the way they did historically " but no one ever seems to think a .575 Burton ball lubed with 50/50 Tallow /Beeswax (or similar like SPG lube) with 60gr of 2f is accurate enough.....
and then , in an effort to shoot your weapon accurately they are told they must do everything that wasn't done historically, such as using oddly sized bullets, home brew lube with odd ingredients, glass bedding , etc.
In 1864 , if you were issued an Enfield rifle as a US soldier (we'll take the difficult Pritchett cartridge out of the equation ) you would have gotten , likely , a P53 that came in from England , that saw use in Crimea and along with it 5 bundles of cartridges containing .575 Burton balls....and you would have made it work. You wouldn't have been testing powder charges, sizing bullets, using bondo, etc.
I rolled up 50 .575 Burton (Minie) balls lubed with SPG lube.... with 60 gr of 2f, into 1863 pattern cartridges and took my CS Richmond shooting , and it did just fine. Could it have done a little better with some odd bullet size? Maybe I don't know.
Just get good bullets and head back to the range.