And check the laws good. The AGFC handbook (and the website) you can get anywere lisence are sold, says:
Hunters may use muzzleloading handguns as long as the barrels are at least nine inches long and at least .45 caliber if they shoot conical bullets (200 grains or heavier). If round balls are used, the minimum caliber is .530. A hunter may carry a muzzleloading handgun of any caliber as backup to a muzzleloading long gun.
But it dont say, if carried as back-up, does barrel length matter? But it'd sure be silly if you could carry a .32 with a 9" barrel but not a .50 with an 8" barrel
And BTW, most things I read on the Plains pistol says 8" but some websites say 9", and even some say 10". I think lyman says 8" though, but I'm not sure as I havent recived my kit yet.
Anyway, I emailed AGFC about the barrel length when carried along with a legal ML long gun. My email was forwarded to the director of enforcement, who mailed me the enforcement code on muzzle loaders. It goes into far more detail, stating that even a cap & ball revolver may be carried, so long as your carrying a legal ML long gun, too. The handbook mentions nothing of cap&ball revolvers, anywere.
I'm going to carry mine next year, in .50 probably with a conical of some type if it'll shoot any of them good. But my first 2 deer will be shot with the CVA Bobcat, unless one sneaks up on me, and the Bobcat isnt at the ready. Only after I put 2 in the freezer, will I wait for one to get within 30 yards and use the Plains pistol...