Not a stupid question. You could still load it with 45 Colt and carry the 45 Colt sidearm as you intended...I gotta tell you though, a 454 in a light rifle like that is going to jump back at you. I believe the 454's cost more than the 45's, so is it worth it to you the extra money? The 454 in the rifle will be pushing 45-70 300 grain factory load ballistics.
There isn't many things the 45 model properly loaded won't kill in the US...comes down to your preference.
Regards,
Manny
Last edited by mannyspd1; 12/04/22.