No, i would go with Triple7 3FG and the 220gr or larger Dead Centers. You could try the 357 195gr but those sabots might be a bear to load. They are pretty tight in every 45cal ive tried. You can always swap out to the Harvester sabot with the 45x40s but you only have 1 choice with the 45x357. .Look at the QT series also. The QTs are a little cheaper.
Cutting Edge Bullet, Lehigh Defense and Fury Custom Bullets all offer some cool 40cals for muzzleloaders. Fury is really new to the ML game but he is the only one offering bonded core bullets in 40cal.
BTW for practice get some 40-200gr XTPs or Hornady HAPs. They usually shoot great and will save you a lot of money on load work. Its even ok for hunting if you keep the speed down to around 1800fps or so,