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G19/23 Point of Aim or Zero Out of Box

5K views 10 replies 5 participants last post by  Otintx 
While my guess would be around 15yds (Glock would measure in meters). The armorers manual notes that each rear sight option (6.1mm, 6.5mm, 6.9mm and 7.3mm) represents about ~61mm in bullet impact at 25m (about 27 yards). The fact they know that and report it makes me think they at least tested at 25m.

If you run a ballistics calculator like gundata.org on 9mm ammo, you'll see the difference between a zero at 15yds and 30yds is pretty negligible, so they could have used something else when designing the sights and still get pretty much the same result. If I put 27yds (25m) into gundata.org I get the data for 15yds so I used 30yds to compare against.

For the typical self defense calibers, the distances they would practically be shot at are going to be within point blank range (distance the bullet will hit a target without compensation for drop). A Glock front sight is ~.5" above center of the bore so at 0yds you'd be .5" low but at 5yds with a 15yd zero you would be .27" low and not get more than 1/2" high or low until over 40yds. Same with a 30yd zero.

I checked .40S&W at 15yds against the 9mm data and they were pretty close, .40 starts dropping a little sooner but not enough to justify a different zero.
 
I can completely geek out on this stuff but it’s been a few years since I dug into it so I’m not remembering everything (getting old and forgetting more than I know).

You can pretty safely assume that if the size of the group is changing it’s likely the shooter. Going from 10 yards to 25 yards is not far enough to make a significant change in where the bullet hits but it is far enough to make it really hard for a shooter to hit the same spot repeatedly.

I was talking to a co-worker about a match I had just shot and they asked my opinion about what to do if we ever had an active shooter? I responded “stay 25 yards away” [emoji23]

If we take the shooter out of the mix, whatever size group was shot at 10 yards should be nearly the same size group at 25 yards just at a slightly different height on the target.

To answer the question about “some guns” - with the same ammo going from 10 to 25 yards, there would have to be something really odd about the gun to make POI be more than an inch or two different. Standard 9mm ammo is point blank range from 0 to over 30yards - meaning the bullet is not going to move more than 1/2 inch up or down over that distance. I think there would have to be something defective about the gun to cause a much larger change.

Once you start approaching 50yds though you will have to adjust for bullet drop as handgun rounds start to fall fast beyond that.


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