bsteve
Sounds like a really good plan. The t7 -2f should work great for you...
With the t7 if you start getting the "crud ring" give a shout I think I might have a way to beat that also. If you have difficulty getting the sabot down the barrel give another shout - there is no good reason to have to struggle to get one down.
Make sure you boil out the barrel before you start shooting - get it clean...
Good luck and great shooting...