Posted: 12/2/2014 10:48:13 PM EDT
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308 FGMM 168gr. 0.462bc, 2650 fps, 1.7" above bore.
I am 19" low at 325 meters. How low should I be at 325 meters if the zero is at 200m? My scope adjusts 1 click per cm at 100m. I ran a ballistic calculator and it seems I should be 10" low at 325. If my math is correct, I need 10 clicks up. |
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Why are you running your ballistics calculator in inches? Run it in mils and everything will be easy to see. No conversions.
Also if you see the impact on target low look at your reticle and it will tell you how much elevation you need to dial up. Think of the mil reticle as a ruler and you just need to read it. |
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Quoted:
Why are you running your ballistics calculator in inches? Run it in mils and everything will be easy to see. No conversions. Also if you see the impact on target low look at your reticle and it will tell you how much elevation you need to dial up. Think of the mil reticle as a ruler and you just need to read it. this, change your app to mils with a 1/10th change per click and BAM. if not conver inches to CM and go from there. when using your reticle make sure you either have a FFP scope or you know what power your reticle is set for. (most are full power) |
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Again, he has a mil scope. There should be no talk in inches. He should run his data in mils and dial on what the ballistics program says and then adjust accordingly using the reticle to tell him how much from his point of aim to his point of impact.
And 10cm = 10 clicks is only true at 100 meters. But again there is no need to talk in a linear measurement(CM) and clicks. You shouldn't be counting clicks. You have large numbers on the turret knob and you dial to the proper adjustment. If you had to dial 8 mils you aren't going to count 80 clicks are you? No you will dial to the 8. |
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Quoted:
308 FGMM 168gr. 0.462bc, 2650 fps, 1.7" above bore. I am 19" low at 325 meters. How low should I be at 325 meters if the zero is at 200m? My scope adjusts 1 click per cm at 100m. I ran a ballistic calculator and it seems I should be 10" low at 325. If my math is correct, I need 10 clicks up. no, you only need to come up about 3 clicks, then double check with a 3 shot group. I just ran JBM with your values. According to it you should be a total of 15.2" low at 325m for a 200m zero. I just rounded the difference to 4", and converted to 10.16cm. However, at 325m there are 3.25cm per .1mil clicks, so 10.16/3.25 = 3.12 clicks. Are you sure you used meters and not yards with the calculator? |
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According to my calculator, you should be 23.7” (1.85 MILS or 6.37 MOA) low at 325 meters with a 100 meter zero and 15.1” (1.18 MILS or 4.06 MOA) low at 325 meters with a 200 meter zero. So if you are currently 19” low at 325 meters and you really want a 200 meter zero, you need to come up 3.9” by increasing your current departure angle of 5.49 minutes to 6.53 minutes (i.e., come up 0.40 MILS or 1.04 MOA).
However, my question would be why did you choose a 200 meter zero? What not just optimize your ballistics for maximum point blank range (MPBR)? A 207 meter zero yields a +/- 3” 242 meter MPBR. With this MPBR setup you would be 1.4” high at 50 meters, 2.9” high at 100 meters, 0.5” high at 200 meters, 10.3” low at 300 meters and 14.4” low at 325 meters. The laser bore sight dot would be POA at a target placed at 22.1 meters or would be 0.93” below POA at a target placed at 10 meters. |