In order to allow for the inability of having a perfect bullet start from stationary to over 1000 fps about instantly, and perfectly follow the turns of the rifling, and all of the other factors of launching a chunk of lead accurately (and repeatably) at a circle on a piece of paper at a distance of 40 rods, Pope, along with his contemporaries did everything as accurately as possible. To get past the things he couldn’t overcome with accurate machinery he utilized Schalk style rifle grooves to hold the bullet and impart spin to it with as little upset and distortion as possible. In addition he used gain twist so as the bullet went through the barrel and accelerated, it was distorted less. Also he used left hand twist and a tapered bore to ensure that each bullet was made to go through the barrel and leave the muzzle as perfectly and consistently as possible. Supposedly he opined that if you eliminated as many variables and did everything as accurately
and consistently as possible, you’d have an accurate shot each time.
With current barrel steels and modern boring machinery, it would follow that if gain twist and a slight internal taper in the bore are utilized, you should be able to produce by machine what HMP did so laboriously by hand. Of course all manufacturing has tolerances, so you will still get some good barrels, a few very good barrels and one or two outstanding barrels from each batch. For best results, get one of those one or two!
Froggie
PS The jury is still out on RH vs LH twist… apparently it really doesn’t make that much difference or, as someone already observed, more barrel makers would be using it.