How much of a difference in trajectory is there between a black powder ball and bullet?

With a 1:66 ratio you will have to use patched round ball. That is a very slow twist, 1 revolution in 66in, and a conical bullet will not stabilize in that rate of twist. Perfect for patched round ball though.How much of a difference in trajectory is there between a black powder ball and bullet?
The difference can be guesstimated if you can find the trajectory formula that includes sectional density. I'm not sure what it is exactly, but it has to do with the bullet weight vs. the diameter and length. Many of your rifle re-loading manuals explain this better than I ever could. I'm partial to the Lyman Reloading manuals and they may have one specifically for black powder.


Good luck and Good shootingHow much of a difference in trajectory is there between a black powder ball and bullet?
It depends on your gun.The twist of the barrel will make the


difference.
A lot. Some left and right, but most down for the ball.