178 AMAX ballistics oddity?

madman25

madman25

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i went shooting on the island with some buddies in a gravel pit over the weekend, i took my 700 vls 308 with me, and a box of 50 loads i make, 178 amax over 43.2 of varget.

we set up some clays at 2 different ranges
now i have a 4200 6-24 mil dot
at the closer range the clays were .875 of 1 mil marking on 24 power, so thats .4375 mils i think, and the clay is therefore 274 yards away, right?

and then the second were 1/2 of a marks, so .250 mil, and 480 yards
so far i think i am correct

now the odd part is i only had to hold up 1 mil marking, which is 1/2 mil as far as i understand, but this is odd as the drop from 270 to 480 i would think should be way more that that given the .495 BC of that bullet, i used ballistic! in my palm and to get that little drop they would need to be going way too fast for that little drop, any thoughts
 
If possible, get a laser rangefinder that has shown to be accurate and consistent and range the targets. Mil dot ranging is an estimate and can be off by quite a bit.

Then get a velocity of your load.

The BC of amax tend to be higher then published but your results are predicting some pretty fancy numbers. There is a rational answer to this descrepancy.

Jerry
 
i understand all the above issues, but i dont think there is any major error in the estimated range, and i am factoring in temp, altitude and such in my balistics software.

but a drop of 1/2 mil, or 1.72 MOA is what i was observing, about 8.6" from 270 480 seems way too small,

am i right to assume 1 mil mark at 480 yards at 24x on a 4200 6-24 is 1/2 mil, or 1.72 min, or have doen something wrong?
 
someone here at work gave me an idea to ask, can thermal air rise, say off a giant gravel pit have an effect?, acording to the calculators i have a drop of 25-35 " is normal and as i said i was observing 8 or so
 
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