I had a Savage muzzleloader. I wanted to upgrade the barrel, and I bought a Krieger 505 gibbs to replace it. Since I had ZERO experience in gunsmithing I bought a barrel from midway, a 458 barrel from A&B with a 99 ( straight 1.250) contour.
I cut it to length, I cut the barrel taper, breech and crown. A $70 investment so that I would not screw up a 350 barrel :-)
That worked out great so now I have a cheap 458 barrel sitting around. I decided that it would be worth it to buy a Savage action and attach the barrel to see if it would shoot.
Some loads are better, and some are worse, but here is a 3 shot group @ 100 yards with an A&B muzzleloader.