ED,

Just so you know I live just a little south of Grand Rapids, MI.

In his article John chose to use a bore diamater of .962 and turned his brass on a lathe using shotgun primers and pyrodex powder about 400grains behind an 1850 grain lead bullet.

His barrels were 12 groove with one twist in 66" when finished the double weighed in at 24lbs.

Also I have found that Huntington has 4 bore brass available at $35.00 ea.

Gregg