Looks like there are a coupe of options for all copper. Good to know they can be sized. Thanks.I'm not sure about current production Knight 45 cal. barrels but my older Disc Elite takes a Barnes .451 250 grain TEZ with no sizing, just a knurl.
If you do have to size, I have sized lots of Barnes all copper bullets in my Swing-Lock 45 cal. smooth sizing die, they go through the die with little effort.
Swing-Lock dies are expensive but are worth every penny when you want to try different 45 cal bullets in your 45 cal. muzzleloader. I use my die in a RCBS Rockchucker supreme press.