ORIGINAL: Underclocked
Chap, it's a muzzleloader bullet and it's marketed by TC. Hornady does market a200 grain .40but for .45 caliberand I'm pretty sure that would be the exact same bullet with a different color tip and of course a different sabot. They list a BC of 0.265 for that one.
I had not seen the BC for the bullet until Lee posted it.
Wow, .265, that is pretty high, will have to look into this bullet and the ballistics on it. Chap