I just came back from a range session with the 45 cal GM LRH barrel. I was shooting the Harvester EZ load 45/40 Sabots and Nosler 150 gr and Hornady 200 gr. XPT 40 cal bullets.
The left target is the 150 gr Noslers with 70 gr of Pyrodex P at 50 yds. 5 shots @ 1.175" C-C. Center target is 70 gr of Pyrodex P at 50 yds with the Hornady XTPs. 5 shots at 1.550" C-C (with 4 in .80" C-C).
Notice there is nodifference in POI between the two bullets.
I put a new target up at 100 yds and fired 2 of the Hornadys - looked through the scope and saw both were 4" high. Fired 2 of the Noslers and that confirmed both the sight setting and both bullets hit the same POI.
The rear sight was almost at its lowest setting so I dropped it down as far as it would go and boosted the charge up to 80 gr of Pyrodex P. Shot hit the black at 6 o'clock.
I raised it back up a 'touch' and fired the next five shots. These grouped into 1.425". Not too shabby for an old fart with open sights at 100 yds I'd say.
I have to say though that for some reason the lighting was perfect and the sight picture even at 100 yds was crystal clear.