Zero in distance?

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Depends - What are you going to use it for? Most SD handguns with adj. sights I usually zero for 25 yards. The hunting guns 50 to 100 yards.

Larry
 
I'd say shoot it offhand at varying distances and see at what range the groups start to open up left to right. Back off a few yards from that range then adjust for the hold you want.
 
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All my father-in-law's target guns are zeroed at 50 yards! He hates snakes and usually takes them out at 50 to 75 yards. 22, 38, 45,,, it doesn't matter, but come to think of it I don't think he owns a 9mm!

Ivan
 
Could be different for different types/brands of ammo. If using for CC, pick your carry ammo and zero with it. If you zero it at 15 yards using a center hold, it should be OK at any distance at which you might need to use it. Most SD shooting incidents will be inside 10 yards, often much closer, and you probably will be shooting more or less instinctively (without using sights) anyway if you are ever involved in one.
 
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Zero range does not matter. There's virtually no drop from the muzzle out to common self-defense distances, so the only thing you're accounting for is the vertical difference between the sights and the muzzle.

Verify that the windage is lined up, and have at it. Which, unless you've slapped aftermarket sights on it, is all you're going to be able to do. I believe the Ruger Security 9 is only available with drift-adjustable sights. And windage shouldn't be distance-dependent, assuming everything else (i.e.--the shooter) is working correctly.

I would spend more time learning how to shoot sans sights--not difficult, just requires solid fundamentals--and shooting strong-hand only.

If you're talking about zeroing in a laser--as the Security 9 is often packaged with, although I don't know if the included model is adjustable--I would suggest an offset zero. In other words, if the laser is 2.5" below the muzzle, adjust it so the point of impact is 2.5" above the laser dot. Thus zeroed, PoI/PoA should remain negligible at any reasonable distance, and a great many unreasonable ones.
 
This is just my opinion, and subject to ridicule! I would suggest 25 yards. In the vast majority of defense situations.....the shooting is “point and click”! If the firearm must be used at distance....it would be nice to be able to hit your target. The off duty officer that took down the shooter in the Salt Lake City mall several years ago, did so at distance. While this a rare situation....having the ability to hit your target at longer distances mat save your life or someone else’s! memtb
 
Even with subsonic ammunition, there's only 2" of vertical dispersion from point blank to 25 yards. Actually, if you zero'd at 1y, you'd hit 2" high at 25y. You'd probably be zero'd at 1 and 75 yards.
 
I shoot 25 yards with handguns, but using Kentucky windage I shoot 100 yards just for experience. My Cz85db in 9 mm using 3’ of Kentucky windage will make pin point shots at the small rocks on the berm at 100 yds. Your mileage may vary.

After a shoot at 25 yds I go out to 100 yds just for the experience. One must know his limitations.
 
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