I buy used .454 at the local range. Can't remember the price, sorry - but I use it to load up 250g RNFP with Trail Boss for plinking at the range after I fire off a few real .454 rounds.
Contender....... odd caliber??? Please don't do that to me! :lol:
Using the .454 brass eliminated the ridge I was building up in my cylinder from shooting .45 Colt ammo. (SRH)