... is correct. It was discovered some time ago, the "shotgun" 209's were a tad too hot. I know for sure the T7 209's are toned down a bit.
Nothing wrong with casting some lead to save $$$
It might take a bit of experimentation though to get it right.
With the T/C, you're going to want the OD of the bullet/sabot (measured at the petals) to be around .505 Thus, your bullet needs to be .451 or .452 T/C's like a fairly tight bullet/sabot combo.
Shoot 'em up and good luck!