I had 50's and decided to get a 54 in case I ever got to elk hunting. A 54 is lighter than a 50 assuming same barrel blank. If possible also get a swamped barrel. Once you've carried one you'll appreciate the saved weight and excellent balance. The largest choice of options goes to 50 cal and in my parts most gun shops will have 50 and 54 but not much in other BP calibers.