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But a revolver's muzzle starts to rise as soon as the bullet begins moving out of the case, and the heavier and slower the bullet, the more rise occurs before the bullet clears the muzzle. For this reason, it throws heavier bullets higher.
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ALL handguns do this, revolver, semi auto and single shot. What varies is the degree. Rifles and shotguns, too, but to a lesser amount, (at the same recoil levels, usually....
It happens because the point you are holding )pistol grips or buttstock) is below the line of the bore. Stright stocked rifles do it the least, handguns the most.
Bullet hitting high, low, or to the sights at a given range is due to the sights being regulated for a certain bullet weight at a certain speed and distance. Change any of that, and the sights are "off" for what you're doing.
Muzzle rise happens, beginning as soon as the bullet starts moving. Heavier bullets moving slower than lighter ones spend more time in the barrel as it is moving up, so lighter bullets print lower on the target. Generally speaking. These can be adjusted for, using different loads, or as a last extreme, modifying the sights.