I was dead on with my Mosin 91/30 and its original ladder sight, using Hungarian 180gr surplus.
I wanted an aperture sight picture so I got Mojos.
So far, it's been a mistake.
#1: Now, my preferred 180gr ammo (of which I have over 2K rounds left) shoots high with the rear sight bottomed out. I need the front post to "grow" somehow.
#2: The Mojo rear sight does not retain position well under recoil. If I have it cranked up a few clicks, by shot #2 it will have vibrated back down to the zero position.
I have yet to try it with 150gr ammo. Not sure if I'm going to bother with 150's, or if I'm going to remove the Mojo and put on a scope mount that utilizes the rear sight mount instead. My whole "purpose" of the Mosin is to shoot 180gr heavy softpoints for elk. Poor man's aught-six.
But... I'm disappointed by the Mojo's results.