Nice Garand.
Ive never slipped my drum to match my ammo. I'm not sure what the sights were actually calibrated for...the original 173 grain 06, the 150 grain ANM2?
Guys in WWII moved to using just AP as the war went along another bullet weight to deal with.
My 168s probably won't match at any range or maybe at one but not another. Guess they might be close enough for steel.
Read a few things here and there regards the use of sights seems not many had the chance to really use them. William Manchester writes of engaging a sniper slung up range style and won. Read one account of a soldier in N. Africa that as a lark took a well guesstimated aimed shot at a German at extreme distance and was shocked to see him fall but than get up and run.
Thinking about the few Pacific combat films that show Marines and Japanese in the same frames seems the shooters lifted and reflexively looked down the barrel. Most of those events appear to be point blank range.
Still the M1 sights are a marvel. It didn't take long to figure such a rear peep setup should be on the 03-A3 and the M1 carbine, carried into the M14.
Neat engineering that you can have a knob either side of a shared axle and one cause causes horizontal movement while the other controls vertical, like magic.
Robust and user friendly.