Beagle is correct.
When I started shooting, I used .451s because I thought .454s were TOO BIG to use because they wouldn't fit LOL
Luckily, had no chain-fires...
But then I learned about the shaved ring, and all was well.
and welcome to the sport, Jetchlnger. Warning, you prolly won't be able to stop with just one Colt and one Remmy.