Billk;
I load for a .44-40, was getting 8-10" at 100yds, finally slugged the barrel, the groove was .429, but the chamber is too small to accept a loaded round with a .429 bullet, so I made a sizer to .428 and have it shooting 2" at 50 yds or less.
The factory 200gr is .426 and is a waste of time, the 8-10" at 100yds again, 200gr lrnfp at .428 do ok, under 3" at 50 yds, with 8.5gr Universal, 1240fps, 240 swc gc with IMR 4227 at 1650 fps do under 2" at 50yds and 310gr fn gc at 1350fps with H110 do the same, all are game loads at 100yds.
This is with the old 1910 factory sights and my 64 yr old eyes.
Slug your bore and find out what the groove diameter is, then find a jacketed bullet to match, or start casting and make them .001 or .002 " over groove diameter.
2400, IMR 4227 and H110 all do nicely with heavier loads.
Don
