Mikecr, thanks for the reply. Ihave been shooting rifles for apx 16 yrs. Befor that it was a shotgun state. I dont even know if my shotgun even works anymore. I dont know enough about MOA or MIL, drop charts or dope charts, but I am hungry to learn more. I have learn more about long distance shooting on this site then with any of my hunting buddys. I want to reload and am in the prosess of setting up a 300RUM I got back in 2001. I ordered a NightForce scope and plan to take this rifle to MR. HART. in PA. for a tune-up. I have always sighted my guns at 1" high at 100yrd, and put deer down on the first shot. I have learned their is a hole lot more to shooting then just 1" hi. I am hungry to learn more. I have learned this takes time and a lot of money. These tricks seem easy when you have been doing them in the field for a long time. I am realy just getin out of the gatePlease excuse my lack of knoledge, it will come to me in time. Bill Maylor.
I think MOA math is easier for ranging. Just take the size of target and divide by the number of MOA's it's subtends then multiply by 100.
So say you see a mule deer, which average 18" from bottom of chest to top of back, and this measures 3.7 MOA's in your scope. Divide 18 by 3.7. You get 4.86. Your range is 486 yards. Of course, the farther the animal, the less accurate it becomes. If your rangefinder is forgotten back in the truck, this method would work in a pinch.
If you have a good drop chart and rangefinder... then I think both work equally well.
(18/3.7)*100 = 486 yards. Now, if I key it into LoadBase 2.0 or Exbal, they both say the answer is: 465 yards. That's 21 yards difference. No big deal we would say, the thing is that at 700 yards the accumulated error is big enough to miss the whole deer.
Let's say 18" target size with a reading of 2.4 MOA... (18/2.4)*100=750 yards. But LoadBase says is = to 716 yards. Difference is only 34 yards... My 300 RUM 210 gr. Beger would shoot 13.8 inches higher if I adjust for 750 and it's only 716 yards. If you're lucky you just miss the whole deer.
What is the problem then? Let's convert the size of the target 18" into moa. 18/1.047 = 17.19198. Now let's do the whole math again:
17.19198/2.4)*100=716.3 yards. That's much better. NOW YOU CAN SHOOT!
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Now thats coollight bulb. Where can I find these kind of math? That is a hugh differance. Idont understand, or how they came up with minute as a math turm? Can someone rec. a book or mag that can explain these terms in use? Thanks Bill Maylor.