I bought a Contender several years ago and have been extremely happy with it. I have barrels for 7-30 Waters, .44 mag, and 22 Hornet. I reload for everything I shoot and have had zero problems with any of the afore mentioned calibers. I've been lead to believe that shooting rimmed cartridges out of single shot TC's will keep you out of potential headspacing problems. I'm looking for a .25 cal rifle barrel for a new Encore, but first would like to know if there is any validity to the rimmed cartridge theory before I make a caliber choice. Be gentle, this is my first foray into an online forum.