Very nice rifle, I thought the thread was on a single barrel as I was thinking it would not regulate with such a under load if in Drachm's ?

I will note in the front of "The Sporting Rifle & Its Projectiles" by Lt Forsyth is a small note from the publisher that Lt Forsyth is referring to Dram 27 1/2grs & not the 60grs of the Drachm in the book !

With the full load you could shoot Buff with a harden ball ?