T/Cs undersized bore is such a pain.
The TC has the tightest bore of the common in-line guns. Two good options are the Magnum Muzzleloading Products HPH-24 and the Crush Rib sabots. Both work very well in TCs.
The MMP sabot is a few thousandths under "normal" size and the design of the Crush Rib sabot makes it very forgiving of bore dimension differences. You can order both online.
http://www.mmpsabots.com/http://www.harvesterbullets.com/My in-line is a Savage 10ML II in stainless and laminate with a Sightron SII Big Sky 3-9x42 scope.
It has the most positive ignition and best sealed breech in the industry and has the strongest barrel ever put on a production muzzle loading rifle. Throw in the Accutrigger and smokeless powder and it's the easiest rifle in the market to live with. The only wear part is a $3 vent liner which is a glorified hardened hollow screw in the breech plug that takes all the abuse from firing. You replace the vent liner and clean the rifle every 100 shots or 100 deer-whichever comes first.
With smokeless powder you don't need to clean it every time you shoot it and there is none of that silly spit patching between shots that a lot of folks think is a normal part of muzzle loading. You shoot $22 a pound powder, use far less of it, don't have to clean the gun every time you shoot it, don't ever need to replace the breech plug etc. It has the lowest life cycle cost of any muzzle loading rifle. Remember that most pellets run around $80 a pound and you use 2.5-3 times as much by weight.
Since you use 70 or more fewer grains grains of powder than a traditional in-line there's a lot less recoil, too. It's a hard combination to beat.
I use either a 300 grain Hornady non-magnum XTP for inside 170 yards or if I expect a chance at a longer shot I use a 275 grain Barnes XPB out to 250 yards. Both are stone cold killers and shoot in the 1 MOA or less range with AA5744. By switching to N120 powder and cranking the charge up you can launch the 275 grain XPB at 2300 FPS (or more) for a 230 yard 6" kill zone. At 200 yards there is less than 4" of windage with a 10 MPH side wind. Just put the crosshairs in the middle of the heart/lung area and squeeze...
The 10ML is back in production with a blue steel and synthetic offering and I'm hoping to find one at a price I can afford so that if something ever happens to my current one I won't have to go back to standard muzzle loaders.
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