Rogmatt My thoughts on this is the only barrel makes in 45 is the
combination 45/410 that I know of, It gives long lead for 45 colt.
Long ways from bullet to rifleing, not good, So MHO, go with 44 Mag.
If you reload for 45 you equal 44 with 45 but not with factory ammo,
unless you hot loads from some other than Rem, Win ,Fed, just my thoughts, Marv.
PS hope this helps.