Twist isn't the problem because the rifling is certainly deep enough. Bore volume on that baby will limit the amount of powder you can use before the "law of diminishing returns" bites you. Just remember: pistol shot; 20 yards...half pistol shot; 10 yards...dragoons usually used their pistols at "touch" distance. Besides which: Every great piece of military art showing showing horse troops "pistoling" some other poor sod, they are always just about touching the enemy and holding the pistol lock up. Never knew what that logic was but it seemed universal during that time period.
Bye the way...super pistol, guy, great job! :hatsoff: