AR Sponsor
Posted: 11/22/2011 6:33:34 PM EDT
| At what range do you zero your AR? My first AR was/is a Colt A2 20". So I did the RIBZ, 100 yards, which was fine for awhile. With my new carbine I built that has a 14.5 inch barrel, I decided to go with the Santoze IBZ 50yard/200 meter zero. The 100, 150 and 200 yard steel got hammered today. Next week I will move one of them out to 300 and see. It will be hard since these are the Widenders 7.5X13.25 3/8 targets. So we will see, if I can see them at 300. |
| I use the 50/200 zero, as there is no more than 1.6" of variation between POA/POI from 0-250 yards. I believe with the 25/300 zero the difference is something like 8" IIRC. I also like that the 50/200 zero allows me to see what I'm hitting at 50, but it's far enough to allow me to see if windage and elevation adjustments are needed. For my application (HD/patrol rifle), I cannot see making any shot past 200 yards...more realistically 100 yards or less. |
|
Quoted:
I use the 50/200 zero, as there is no more than 1.6" of variation between POA/POI from 0-250 yards. I believe with the 25/300 zero the difference is something like 8" IIRC. I also like that the 50/200 zero allows me to see what I'm hitting at 50, but it's far enough to allow me to see if windage and elevation adjustments are needed. For my application (HD/patrol rifle), I cannot see making any shot past 200 yards...more realistically 100 yards or less. I think its only 4 inches out to 300 |
|
Quoted:
you can get close to a 300m zero at 25m, shoot .1 inch low and that should put you on paper at 300m.....wont waste quite as much ammo.......should be close if i remember correctly OK. But I want the 50/200. When I want to shoot 300, I'll set the sight on 300 instead of 8/3 -2 A 25 meter zero would put an M855 bullet 8+ inches high at 200 |
|
Quoted:
You do realize that with the RIBZ method you still have the IBZ also (8/3 -2clicks instead of 8/3 -3) don't you? The RIBZ simply gives you the 100yd zero in addition to the 50-200 as well as all the standard settings. Yes, I did. But it's just the ability to do both, one doesn't get both. I believe its a one or the other proposition. I find the -2, 50 yard zero is a better(for me) multiple target setting like we have at the range. A 100 yard zero would put the bullet almost 5 inches low at 225 ish yards whereas the 50/200 would put it about an inch low at 225 |
|
Quoted:
Quoted:
you can get close to a 300m zero at 25m, shoot .1 inch low and that should put you on paper at 300m.....wont waste quite as much ammo.......should be close if i remember correctly OK. But I want the 50/200. When I want to shoot 300, I'll set the sight on 300 instead of 8/3 -2 A 25 meter zero would put an M855 bullet 8+ inches high at 200 The free ballistics calculator I have only allows for a sight of 2" and comes up with +5.9" at 200. My sight is actually 3" above bore center so +8" sounds about right... in my rifle anyway. FWIW, I use the 50/200. |
|
Quoted: Quoted: You do realize that with the RIBZ method you still have the IBZ also (8/3 -2clicks instead of 8/3 -3) don't you? The RIBZ simply gives you the 100yd zero in addition to the 50-200 as well as all the standard settings. Yes, I did. But it's just the ability to do both, one doesn't get both. I believe its a one or the other proposition. I find the -2, 50 yard zero is a better(for me) multiple target setting like we have at the range. A 100 yard zero would put the bullet almost 5 inches low at 225 ish yards whereas the 50/200 would put it about an inch low at 225 One does get both. The RIBZ gives you a 100yd zero at 8/3 -3 AND the IBZ 50yd zero at 8/3 -2. Both still allow you to use the regular settings on the dial as well. As a matter of fact you can set up the RIBZ and sight in at 8/3 -2 at 50 yards if you wish. Of course nothing is going to be 100% on the money, but doing the setup for RIBZ and the zeroing at 50yds on the 3/8 -2 setting (the IBZ) allows you to go that extra click and be zeroed (relatively speaking) at 100 when you want it. Going back to the 3/8 -2 gives you your 50-200 yrd "battle zero". All my A2 type sighted ARs are set up this way(double the clicks for carry handles and the LMT fixed sight, I don't know about the rest.). It's a win-win. |
|
Improved Battlesigtht Zero (IBSZ) is a 200 meter zero with a convenient trajectory crossover at 50 yards. The bullet will stay within 2" of the line of sight from just forward of the muzzle to 220 meters where it is again 2" low.
At 100 meters IBSZ will place the bullet 1" (one inch) high. There is no need for hold over/under unless your vision and ammunition is capable of differentiating 1" at 100 meters. Plant the front sight where you want the bullet and it'll be there if within battlesight range. If you're using a 2 MOA dot sight all the bullets will stay within the dot. Remember that battlesight is not X-ring shooting. And X-ring shooting demands precision sight adjustments and surveyed ranges. (That's why snipers use all those cool telescopes and laser range finders!) Also note that with the M16/AR15 system the trajectory curve with a 100 meter zero is always low. The trajectory brings the bullet up to where it just kisses the line of sight at 100 and the curve starts down again. Always low. IBSZ splits the difference and is always a tad high in the 50 to 200 meter range, but never more than 2" and usually no more than 1". –– Chuck |
AR Sponsor