While taking a Drivers Ed class (have to take it here in VA to get your license. Oh, how I miss Florida for that!) today (nine days in total), I started writing down some things that I actually enjoy: balistics. Here is a situation (first one) that I gave myself to fiqure out.
1,000 yards- (Made up stats) .308 168smk, .520 BC, 3,100fps, 68% humidity, left to right half value wind of 10mph, 156 in. drop, 68 in. wind drift.
1/4moa (based on 4 clicks=1") at 100yd. per click. 1/4 x 10/1 = 2 1/2 in. per click at 1,000yd.
This is what I fiqured. 7 clicks = 20 in. Solution - ~55 clicks or 13.75moa down and 3.0625moa (for half value wind) left windage. (Did I do alright for no information in front of me and no calculator?)
<span style="font-weight: bold">Second Situation</span> - 1,500 yards (Made up stats) .338 Lapua 230g., 3,250fps, .610 BC, 68% humidity, left to right full value 15mph wind. I didn't give myself the drop or drift information for this range.
1,000yd. stats - (Made up) 45 in. wind drift at 10mph, 110 in. drop, ~2 sec. to impact, 2,750fps (probably way off from actual stats) at impact.
So, 50% increase in wind speed, 50% increase in range, 4 sec. to impact (made up), 1,900fps at impact.
1/4 x 15/1 = 3 3/4 in. per click 3=15 6=30 9=45
From that information, this is what I got.
1,350fps depression total, (based on 1,000yd stats) 1 in. = ~ 4.5fps depression (if it were to really work like that).
<span style="font-weight: bold">Solution</span> - 67.5 in. wind drift, 300 in. drop
3.375moa of left windage, 15moa down
<span style="font-weight: bold">(I know most of this stuff is probably way off, but it was really quite fun trying! Just thought I'd share this with you all.) </span>
1,000 yards- (Made up stats) .308 168smk, .520 BC, 3,100fps, 68% humidity, left to right half value wind of 10mph, 156 in. drop, 68 in. wind drift.
1/4moa (based on 4 clicks=1") at 100yd. per click. 1/4 x 10/1 = 2 1/2 in. per click at 1,000yd.
This is what I fiqured. 7 clicks = 20 in. Solution - ~55 clicks or 13.75moa down and 3.0625moa (for half value wind) left windage. (Did I do alright for no information in front of me and no calculator?)
<span style="font-weight: bold">Second Situation</span> - 1,500 yards (Made up stats) .338 Lapua 230g., 3,250fps, .610 BC, 68% humidity, left to right full value 15mph wind. I didn't give myself the drop or drift information for this range.
1,000yd. stats - (Made up) 45 in. wind drift at 10mph, 110 in. drop, ~2 sec. to impact, 2,750fps (probably way off from actual stats) at impact.
So, 50% increase in wind speed, 50% increase in range, 4 sec. to impact (made up), 1,900fps at impact.
1/4 x 15/1 = 3 3/4 in. per click 3=15 6=30 9=45
From that information, this is what I got.
1,350fps depression total, (based on 1,000yd stats) 1 in. = ~ 4.5fps depression (if it were to really work like that).
<span style="font-weight: bold">Solution</span> - 67.5 in. wind drift, 300 in. drop
3.375moa of left windage, 15moa down
<span style="font-weight: bold">(I know most of this stuff is probably way off, but it was really quite fun trying! Just thought I'd share this with you all.) </span>
