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Discussion Starter · #1 ·
If I recall, it is greater than 1".

But here are some numbers:

Assuming 55gr FMJ, with a ballistic coefficient of about .270, at 3250 fps (full USGI, M193 compatible) which assumes a 20" barrel, you get the follow path for a 200yd zero:

Range Velocity Energy Total Bullet
yds fps ft/lbs Drop Path
0 3250 1289 0.0 -1.00
25 3157 1217 -0.1 -0.01
50 3066 1147 -0.4 0.76
75 2977 1082 -1.0 1.31
100 2889 1019 -1.8 1.60
125 2804 960 -2.8 1.63
150 2720 903 -4.2 1.39
175 2638 849 -5.8 0.85
200 2557 798 -7.8 0.00
225 2478 749 -10.0 -1.15
250 2400 703 -12.6 -2.68
275 2323 658 -15.7 -4.60
300 2248 617 -19.1 -6.93
325 2174 577 -23.0 -9.71
350 2102 539 -27.2 -12.89
375 2031 503 -32.0 -16.55
400 1961 469 -37.2 -20.70

Assuming an inch and a quarter:

Range Velocity Energy Total Bullet
yds fps ft/lbs Drop Path
0 3250 1289 0.0 -1.25
25 3157 1217 -0.1 -0.23
50 3066 1147 -0.4 0.57
75 2977 1082 -1.0 1.15
100 2889 1019 -1.8 1.47
125 2804 960 -2.8 1.54
150 2720 903 -4.2 1.32
175 2638 849 -5.8 0.82
200 2557 798 -7.8 0.00
225 2478 749 -10.0 -1.12
250 2400 703 -12.6 -2.61
275 2323 658 -15.7 -4.51
300 2248 617 -19.1 -6.80
325 2174 577 -23.0 -9.55
350 2102 539 -27.2 -12.71
375 2031 503 -32.0 -16.33
400 1961 469 -37.2 -20.45

See what I mean by a flat trajectory?

:)
 

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Discussion Starter · #3 ·
I'd need the following information:

muzzle velocity
bullet weight
bullet coefficient.

Post those and I'll put it up tomorrow. I'll also put up the spreadsheet calculator

:samurai:
 

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Muzzle Velocity: 2355fps
Weight: 122gr
Ballistic Coefficient: 0.256

Winchester site indicates a 200yd zero as well. I'm thinking maybe 100 yd would be better - since it's not as flat as a .223
 

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Discussion Starter · #5 ·
The low sights on a Mini don't do well for a battle zero on with 7.62x39:

Range Velocity Energy Total Bullet
yds fps ft/lbs Drop Path
0 2355 1502 0.0 -1.25
25 2275 1401 -0.2 0.61
50 2197 1307 -0.8 2.06
75 2120 1217 -1.9 3.04
100 2044 1131 -3.5 3.54
125 1970 1051 -5.5 3.55
150 1898 975 -8.1 3.01
175 1828 905 -11.4 1.85
200 1760 839 -15.3 0.00
225 1694 777 -19.9 -2.57
250 1629 718 -25.4 -5.96
275 1567 665 -31.5 -10.01
300 1506 614 -38.5 -14.91
325 1446 566 -46.3 -20.68
350 1393 525 -55.7 -28.01
375 1342 487 -65.9 -36.12
400 1293 452 -77.4 -45.55


over 3.5" high at 100 yards, and nearly 15" down at 300!!!!

If you used a 300 yard zero, it would look like

0 2355 1502 0.0 -1.25
25 2275 1401 -0.2 1.86
50 2197 1307 -0.8 4.54
75 2120 1217 -1.9 6.77
100 2044 1131 -3.5 8.51
125 1970 1051 -5.5 9.76
150 1898 975 -8.1 10.46
175 1828 905 -11.4 10.55
200 1760 839 -15.3 9.94
225 1694 777 -19.9 8.61
250 1629 718 -25.4 6.46
275 1567 665 -31.5 3.65
300 1506 614 -38.5 0.00
325 1446 566 -46.3 -4.53
350 1393 525 -55.7 -10.61
375 1342 487 -65.9 -17.48
400 1293 452 -77.4 -25.68


Fairly ugly for a battle rifle, if you ask me.
 
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