Point of Impact Correction With Conventional Open, Iron Sights
This question comes up pretty regularly, so here’s what you need to know. If we’re going to correct POI with any precision (which is the whole point) there are Absolutes.
You must determine the exact amount of correction needed at a known or measured distance. Any fractions of an inch should be converted to the decimal equivalent.
You must determine your sight radius. This is the distance between the visible surfaces of the front and rear sights from the shooter’s perspective. A tape measure works fine. Any fractions of an inch should be converted to the decimal equivalent.
To correct elevation via the front sight, you absolutely have to determine the total height of your existing front sight in thousandths of an inch. This means it must be removed from the barrel or ramp and measured with a dial caliper.
Once these elements are known, use a Sight Correction Calculator to determine how tall a front sight you need to correct your POI error. I like Dillon’s, but there are several out there.
If you measure carefully, this works 100% of the time. It’s one of those things that is best done right the first time.
