So I like the Trijicon RMR. I'd like to get the 7MOA dual illum reticle but its never in stock @ Brownells. The 13MOA is however, always in stock. I want to use the optic in 30yds & in shooting. My problem is that I suck at math. Can anyone tell me how big a 13MOA dot will appear to be @ say 25yds? Better yet, explain why/how you get this number. (Give a man to fish, he'll eat for a day, teach a man to fish, he'll eat for a lifetime.)
SeekHer has it right.
To calculate the area a given MOA will cover, use 1MOA = ~one inch @100 yards. So 13MOA x 1 inch / MOA @100 yards = 13 inches @100 yards.
To find the MOA to inches conversion at different distances, multiply by how many times 100 yards the desired distance is, i.e.:
200 yards = 2x100 yards = 2x13inches = 26 inches.
50 yards = .5x100 yards = .5x13 inches = 6.5 inches.
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I got a phone call at the shop from a customer asking about rifle scopes.
HIM: What does it mean if a rifle scope is a 4x-32?
ME: That means it's a four power scope with a 32 mm front lens.
HIM: What does 4 power mean?
ME: That means if your target is 100 yards away, it appears to be only 25 yards away.
HIM: Does the bullet still have to go the whole 100 yards?
Long pause.
ME: Yes, sir, the bullet still has to go the entire 100 yards. The scope merely makes the target
look like it's only 25 yards away. It does not actually warp the space-time continuum.
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Build a man a fire and he'll be warm for a day.
Set a man on fire and he'll be warm for the rest of his life.