Best possible accuracy using traditional iron sights

[HighUintas]

What is the best possible accuracy a person can do at 100 yards using traditional iron sights? Design doesn't matter, other than them being a post/bead/fiber front and a notch rear.

I'm wondering about this in the context of muzzleloaders because I have not seen any evidence that a person can regularly shoot a muzzleloader with traditional iron sights any better than 3" at 100, yet I see many guys mentioning 1", 2" blah blah.

I'd assume that surely someone here has taken their bolt gun that does 1-1.5" large round count groups with a scope and put iron sights on. Or, maybe someone here uses irons regularly instead of a scope and can speak truthfully about their groups without cherry picking and exaggerating their and their gun's abilities.

This is the best I've done with a muzzy, shooting 54cal patched ball from a bench at 100 using silver blade front with a small V notch rear. Winds were gusting to 10-12mph to the left, so I was trying to hold for that. Main group in black is about 4"

 

[RockAndSage]

Man, that is a great question...

 

[Fireflyfishing]

Dang it. I dug through all my photos looking for my M1 and M1A groups print. Couldn’t find them. But…they shoot much better than what you have shown above. Maybe solid 2” groups? I run hand loads in them as well.

 

[HighUintas]

Dang it. I dug through all my photos looking for my M1 and M1A groups print. Couldn’t find them. But…they shoot much better than what you have shown above. Maybe solid 2” groups? I run hand loads in them as well.

Doesn't the m1 and m1a use a ghost ring or semi peep type rear sight though?

I think I could do better than the target above with a ghost ring rear

 

[Fireflyfishing]

Doesn't the m1 and m1a use a ghost ring or semi peep type rear sight though?

I think I could do better than the target above with a ghost ring rear

Affirm. They both have the same sights and the rear is a peep.