Glad you liked it. A friend introduced me to muzzle-loading a couple of years ago. Once I fired that first shot, I was hooked.
Unless you want to, you really don't need to upgrade the stock. I have a Huntsman barrel on a SB1 straight (shotgun/iron sight) stock, it works for me. If you don't already have one, all you really need is a Huntsman fore end (from H&R), collapsible ram rod (available from Mr. Hubbard), and your good to go.
Some members don't even bother, they just carry their range rod to their stand with them.
Regarding your load, if your using the TC Cheap shots (lead hollow points), I believe they're 240grains. I use the same load, over 100grains of T7. The Cheap shots are great on deer.