08-21-2024, 08:09 AM
Hornady has a pdf (108-110 gr gas gun) that also has a table of MV by the inch for a dozen or so velocities/powder charges, showing more or less 60 fps/2-inch barrel length, so ~30 fps/inch. This has pretty much held for me for 16", 18", 20 and 22" barrels. Maybe a couple times, ~35/inch, but that's the ballpark I've seen.