Posted: 11/25/2014 2:56:47 PM EDT
| Not sure how to phrase the question. I purchased a scope with 4 hash marks to compensate for drop. It doesn't give me a lot of info and it's a cheap scope but it's just going on my 300 blackout hunting gun. I'm going to still try and verify at distance but I'm hoping to cheat initially to get a ballpark range for each hash mark. If I shoot with the first drop hash mark at 100yds and say I'm 5" high, could I plug that into my ballistics calculator and plug in a 5" high zero then see where it crosses 0" and that would roughly be the yardage drop for that hash mark? Is there another way that might be easier? I understand all the marksmanship and scope limitations but just theoretically wondering if this idea is sound? |
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Set up a tall target (36" or so) at exactly 100 yards. Shoot 3 shots at a point of aim(sticker/dot) you have placed on the bottom of the target with the crosshair/middle dot/zero hash whatever. Move down to the next hash shoot 3 shots at the same point of aim, repeat for all hash marks. If it is a variable power mark the location you had tghe magnification set.
Now measure the distance between the centers of each group. Say each group is 3 1/8" apart you know that each hash mark is 3 moa for the magnification level you did the test at. So you can use a ballistic calculator with your bullet and chrony info to determine at what distances the hash marks will be zero. Actually for hold overs mag level wouldn't matter. It would only matter if you wanted to scale with the ret. Posted Via AR15.Com Mobile |
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Quoted:
Be a lot easier to just look at a yardstick. Btw those are usually called BDC reticles and are mostly worthless for precision rifles but useful for something like an acog on an m4 I wouldn't say they are worthless seeing as nearly every precision scope comes with them. If you don't have time to spin your turrets for a quick shot on an animal they are very useful. Thanks for the advice on the yardstick that's a great idea and would also save me some ammo. I'm just being a cheap ass and using this scope on my hunting build. I've generally put Nikons or super snipers on my precision builds. I just wanted to confirm my suspicions on my initial sight in. |
| the difference is our definition of precision. :) the "100, 200, 300 yard" hash marks that come on most cheap scopes aren't calibrated to your bullet or velocity or scope height over bore, so they might be in the ballpark, but ballpark isn't "precision" though it may be adequate for minute-of-deer. using a reticle with hashes or dots every 1/2 mil or more will be much more precise and still allow you to hold instead of dialing, you just have to know your dope. |