I'm using 2 parts tallow and 1 part beeswax with 3FG swiss with great success in all my muzzleloaders, extremely clean hot burning powder and the lube leaves the barrel moist from chamber to muzzle. 50 rounds with consistent 100yds accuracy with no cleaning is not a problem and even after months of storage the lube on the bullets doesn't get dry or crumbly.
I'm sure it is going to do an equally good job in my BP cartridge rifle. I think I won't even need a grease cookie.
My current bullets are 520 grain 4 grooves .458, 57 grain swiss 3FG and 62 grain 2FG with very little compression. The bullet touches the rifling, no crimp, Starline brass, Fed large rifle magnum primer.