the best shot with a muzzleloader is double lung or heart like a bow.

If your hunting in Pennsylvania you can use the sabot bullets
what gun do you have? and whats the twist in the barrel ?
(66 to 1 48 to 1 32 to1 etc.....) it will be on the barrel
depending on the gun you have and ammo you can shoot 200 yds
but a flintlock is not as easy as a rifle because of the smoke and delay.
I have a traditions pa pellet that i worked the trigger and
in a gun rest i shoot 1 1/2 group at 100yds with 2 50 grain pryrodex pellets
and 240 grain hornady sabot.
DO NOT USE PRYRODEX PELLETS IF YOUR GUN IS NOT MADE TO SHOOT THEM!
there is alot you can to do to make the gun shoot better.
there is a company in Pennsylvania that sells all types of up grades
for all different guns and tons of gadgets etc..
http://rmcsports.com/catalog.htm
they know everything about flintlocks,and are nice company to deal with.
if you need any more info that i can help just reply on the post