https://matchgrademachine.com/custom-thompson-center-muzzleloader-barrel/

Has anyone here used an MGM muzzleloader barrel? What bullets and powder loads have you tried?

I think it was sometime last year that MatchGradeMachine revealed a line of muzzleloader barrels for the Contender and Encore platforms. For whatever reason, they made them all 45 caliber instead of the much more common 50 caliber. Although this eliminates a lot of potential bullet options, it allows the use of 357 Magnum/Maximum bullets using an MMP 357/45 sabot. Based on what load testing I've done with the CVA Optima and an old factory T/C barrel, it looks like you'd be able to replicate 357 Maximum ballistics, which would make for a good longer range muzzleloader setup.