BH209 is a nitro based powder and cleans up with centerfire type solvents. You can reload and shoot many times without swabbing but it still needs to be cleaned when done shooting. BH209 requires full power 209 primers to ignite reliably. DONT GET 209 PRIMERS MADE FOR MUZZLE LOADERS. Use a regular Win209 or a Mag primer like CCI209M or Fed209A.
Triple7 is not terribly corrosive but it does leave a nasty crud ring making it almost impossible to reload within a shot or two. Swabbing between shots is more or less mandatory.
Pellets are the most expensive per shot cost and produce the worst velocity. 2 pellets makes about the same speed as 80grV of BH209 or around 85-90grV of Triple7 loose. Both Triple7 pellets and Pyrodex pellets offer very similar speed. Pyrodex is just far more corrosive. Both clean up with water based cleaners like plain old soap and water. If shooting Pyrodex i would clean it twice to make sure. Seen the stuff ruin many a barrel that was not cleaned extremely well.
Traditions barrels are often very tight. You will probably need Harvester Crushrib sabots or MMP 3Petal-EZ sabots if its super tight. The 3P-EZ sabot is the same one sold with SST bullets. You can buy them directly from MMP and i think Traditions sells them in 50 packs too.
Lotta deer have died to the cheap old .452 250gr XTP. Much better bullet than the 240gr XTP MAG for typical loads. The MAG is much tougher and requires much more speed to expand well. Speer offers a really good 260gr bullet also. It listed as a plinker but its a really good Uni-Cor bullet. It does not need a ton of speed to expand and its "jacket" is bonded to the lead core. Very similar design to the more expensive DeepCurls and GoldDots.
https://www.speer-ammo.com/products/bul ... ullet/4481
Get a box of them at Grafs and some sabots. That should get you started cheap with a load that will easily kill deer.
https://www.grafs.com/retail/catalog/pr ... ctId/17363
https://www.grafs.com/retail/catalog/pr ... uctId/5465
You will need a couple other items to bring the order upto $40 for the minimum.
Get a powder measure
https://www.grafs.com/retail/catalog/pr ... ctId/77950
And a ball starter. You are gunna need one now matter what sabot you shoot.
https://www.grafs.com/retail/catalog/pr ... uctId/2665