Yeah, same for Ruger #3 too: I had both (NEF and RUGER) and had some Lyman .451 "Volunteer" bullets; 450 gr, as i recall. i bought a bunch from a fellow for experimenting in very heavy 45 colt shooting and also for paper patch in the 45/70. I eventually started patching just the base and seating the bullet way out. The patch sealed the base and the rest of the bullet acted as a bore-rider. Allowed for full use of the 45/70.
Definitely not a 45 Colt, tho.