I don't know if this has been mentioned or not, but check your state's regs...some states don't allow 209 ignition systems, some states require the action to be "open to the elements", they may or may not allow sabots, etc.
That may help decide.
Muzzleloading Handgun:
A firearm intended to be fired from the
hand, incapable of firing fixed ammunition, having a single barrel,
loaded through the muzzle with black powder or synthetic black pow-
der, and a single projectile.
Muzzleloading Rifle
: A firearm intended to be fired from the shoul-
der, incapable of firing fixed ammunition, having a single barrel and
single chamber, loaded through the muzzle with black powder or
synthetic black powder, and a single projectile.