When you get your rifle go to NoExcuses. Get a sizing pack of bullets. His conicals are ok but i like the Bullshops much better and Dan is a great guy. Bullshop is run by a simple man leading a simple life that loves what he does. The NASA lube he uses is great too.
This sizing pack will get you the feel for what fits right. You should be able to load with thumb pressure but not too loose.
https://www.muzzleloading-bullets.com/product/50-caliber-sizing-pack/https://www.muzzleloading-bullets.com/sizing-pack-instructions/
