Be careful with the substitutes...

[HawkenBob]

http://www.chuckhawks.com/dangerous_muzzleloaders.htm

Scary stuff. Buddy just bought a CVA Buckhorn from Cabelas. 100 bucks after his coupon.

T7 seems a bit too fast for some of the cheaper guns...especially at maximum loads per the MFG.

[CP]

"Hodgdon Powder Co. recommends that only two 50 grain equivalent Pyrodex or Triple Seven pellets MAXIMUM be used in .50 caliber inlines."

A key point from the article.  Most people don't know this.  Hodgdon's recommendation is for all ML rifles, irrespective of what the rifle manufacturer says.