My thanks to Eightbore, Parabola and Keith for your comments.
I agree that it appears the 500 yard leaf would provide insufficient elevation, but - having learned that notch-less sights were a "thing" - I'm inclined to trust their maker.
Nonetheless, I shall look for an opportunity to set up the rifle in a rest and see just how much vertical difference there would be in the presumed POI at, say, 100 yards, when using the 100- and 500-yard leaves, respectively; then play around with some numbers in a ballistic calculator. I think the G1 BC of a 575-grain 0.72" round ball works out at around 0.11. How much better it would be for a conical bullet is another matter to look into.
Additionally, I have just received a copy of Graeme Wright's Shooting the British Double Rifle, from which I'm sure I'll learn much of use and interest.
Last edited by JulesW; 09/27/25 09:37 AM.
