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Have my rifle zeroed @100 meters and intend to sling some lead at an 8" paper plate around 420 yards... Mils or hold over ideas?
Hold over?
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Scope or open sights? "Mils" is making me think you are using a Mil Dot scope.
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Make a wind call and dope the rifle. Holding over is for the A1 guys..
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Yes. Have a MILRAD scope and wonder what the hold over should be? Will be shooting Sierra 168's and 175's both over 39.5 gr of H4895 #34 primer
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Thanks, this is all new to me and am trying to learn... Wind should not be an issue
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http://m14forum.com/m14/109725-how-kick-m14-irons-grade-4-math.html
Here's a quick tutorial on sight's for M-14
Bob
Here's a quick tutorial on sight's for M-14
Bob
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Thanks Bob but mine has the SWFA SS10MQ
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There's more info that's needed. The velocity, weather, altitude, temperature, humidity. Not really needed for that range but it will give you better data. You can get on Google and search for a ballistics computer. They're free. Or if you have a smartphone there's many free ballistics apps. I have strelok. Try jbmballistics.com. Or g7
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Thanks, am quite new to this and the weather is hot, 80 to 90 degrees and below sea level... Am guessing 2350/2400 fps?
I was looking at my Hornady #6 ballistics tables and am guessing 50/55" drop at 420 yards but what is that in the Mil Dots on my scope?
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1 mil is 3.6" at 100yds if I remember correctly. The easiest way you can do it is shoot and see where on the reticle the bullet hits. So if it hits 3.2 mills low dial 3.2 mils in elevation on the turret. That's just an example, it won't be 3.2 mils...
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Thanks Bob and all who replied... I am not up to this level yet; have bought me a chronograph that I hope to use this winter after I decide on which bullet weight and powder to use... General terms are fine by me at the moment... Looks like 2 1/2 to 3 mils hold over might get me on 'pallet'...lol
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This is for my bolt gun but it should get you close. 168gr amax, 300' asl, 30%humidity, 90 degrees, 2660 fps. Yours will have more drop.
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If you want to learn this stuff there's a computer program called shooter ready. It's a simulator that teaches you everything for the most part. All the math, wind, distance, etc. It teaches you how to use a scope...
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If you find yourself in Yuma we can go shoot if you want...
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Approximate "come ups" for 308 is on the order of 2moa elevation to 200yds. from 100yds., 3moa for 300yds., or total of 5moa, so you need a bit more elevation to get you to the desired range of 400+yds. We know that 1mil is approx. 3.6" @ 100yds. and 2 mils would be some 7.2" and we don't think we need quite that much for 400+?? Not good at mils, tend to think in minutes of angle, but if it were me would hold at the top of the 8" target after coming up some 5 moa from 100yd. zero. Tables will give you conversions from moa to mils to get exact answer, if there is an exact answer due to weather, load, etc., etc. Sure others can give you the mathematical solution to this common situation.
Wind can be a definite factor even at 3 and 400yds. so suggest you be prepared for that if present at the time of shooting. Example of wind solution would be to take the Range of 400 multiply that by approximate wind Velocity. Then divide by 1000 if wind is full value, from either 3 o'clock or 9 o'clock. 400x est. wind speed of say 10mph gives you 4000/1000 = 4moa adjustment either right or left. If not full value(wind from say 1 o'clock to 7 o'clock)take half of that answer and will be close. Again tables can give much researched answers for this issue Load, weather conditions and most importantly the "trigger puller" has a lot to do with finding the correct adjustments. Best of luck to you.
Wind can be a definite factor even at 3 and 400yds. so suggest you be prepared for that if present at the time of shooting. Example of wind solution would be to take the Range of 400 multiply that by approximate wind Velocity. Then divide by 1000 if wind is full value, from either 3 o'clock or 9 o'clock. 400x est. wind speed of say 10mph gives you 4000/1000 = 4moa adjustment either right or left. If not full value(wind from say 1 o'clock to 7 o'clock)take half of that answer and will be close. Again tables can give much researched answers for this issue Load, weather conditions and most importantly the "trigger puller" has a lot to do with finding the correct adjustments. Best of luck to you.
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Jeff, if holding over is your game, wouldn't you be better off with a 200 yard zero? Then you can hold under a little at 100 yards, or just ignore it.
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Thank you so much danthman... g7 shows I will need 2.8 mils up with my inputs as they are...
Jeff
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thanks but I am zeroed for the 'ten dot' I have been shooting and on the way out today set up a pallet across a 40 acre block of lemons to try something different... My last 5 out of my magazine today hit 5 of 5 of the dots...
I want to try this load at some distance.
Jeff
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I am going to take a guess and go with 2.2-2.8 mills? My standard is zeroed at 400yards and when I went from 100 zero to 400 it was around 2-2.5ish. a 10 mph cross wind at that distance would be around .75-1.25mil I play it safe and just go with 1mil and if it half value then just .5 or 1/4 value would be a .25mil hold over for windage.
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