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How does sight radius alone affect point of impact? The only change I could see would be if the barrel was tapered and the actual height of one of the sights was changed.
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If you do it, be aware that the value of the adjustment marks or clicks on the rear sight will change accordingly.
For example, if one click on the rear sight previously moved the point of impact one inch at 100 yards, shortening the sight radius by half would cause the point of impact to move 2 inches per click; etc.
You could calculate it out by percentage of alteration from the current length, etc.
You'll probably end up with "awkward" values if you need to know how much to move it during a match or something.
But if you're just plinking, trial-and-error will suffice without blowing a brain muscle.
How does sight radius alone affect point of impact? The only change I could see would be if the barrel was tapered and the actual height of one of the sights was changed.
I never said it would.
Changing the sight radius
won't change the point of impact
per se, IF the sights are placed perfectly back into the original LINE of SIGHT, (they wont be, due to fitting discrepancies, or barrel taper, as you noted) and IF Barrel harmonics don't change by chopping it. (They will).
But the VALUE of the clicks on the rear sight WILL CERTAINLY change, because the
angle between the line of sight and the line of bore has been altered by shortening the sight radius. ( They aren't parallel to one another in the real world, nor should they be.)
Match rifles such as that are often used in such a manner that the rear sight is adjusted frequently for yardage changes, lighting factors and ammo variations from lot to lot, hence my warning re the value of the rear sight clicks.
( If we were discussing a scoped rifle, the point would be moot and my warning invalid, )
Make sense now?