The FAL Files

The FAL Files (http://www.falfiles.com/forums/index.php)
-   Ammunition (http://www.falfiles.com/forums/forumdisplay.php?f=22)
-   -   Ballistic coefficient for the 147gn .308 FMJBT (http://www.falfiles.com/forums/showthread.php?t=91112)

Pistolwiz November 03, 2003 00:29

Ballistic coefficient for the 147gn .308 FMJBT
 
I can't seem to find info on the Ballistic coefficient for the 147gn .308 FMJBT. Anybody have a source for this kind of info? None of my reloading manuals have this type of bullet. Need the BC to determine down range performance/ trajectory. Thanx to anyone that can help. :confused:

NoNotAgain November 03, 2003 07:08

Hey Wiz

Try .401 BC @2825FPS

Pistolwiz November 03, 2003 11:17

Thank you! I used 2700 fps since that is the velocity published for the loads I am loading. Probably closer to the Port. and SA milsurp I've been shooting also.
I found it interesting that a 25 yard zero got a 220 yard zero downrange. I used Pointblank software. here are the results.

308 Cal, Winchester FMJ-BT, 147 grn
Ballistic Coeff: 0.401
Bullet Weight: 147
Velocity: 2700
Target Distance: 220
Scope Height: 1.500
Temperature: 70
Altitude: 500

Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -1.50 in 2700 fps 2379 fpe 0.000 sec 0.00 in -1.50 in -0.00 in
25 yds 0.00 in 2646 fps 2285 fpe 0.028 sec 0.15 in -0.56 in 0.06 in
50 yds 1.19 in 2592 fps 2193 fpe 0.057 sec 0.61 in -0.44 in 0.21 in
75 yds 2.07 in 2540 fps 2105 fpe 0.086 sec 1.40 in -0.24 in 0.45 in
100 yds 2.60 in 2487 fps 2019 fpe 0.116 sec 2.52 in 0.05 in 0.82 in
125 yds 2.79 in 2436 fps 1936 fpe 0.146 sec 3.97 in 0.44 in 1.25 in
150 yds 2.62 in 2385 fps 1856 fpe 0.177 sec 5.80 in 0.92 in 1.81 in
175 yds 2.05 in 2334 fps 1778 fpe 0.209 sec 8.02 in 1.52 in 2.53 in
200 yds 1.08 in 2284 fps 1703 fpe 0.241 sec 10.65 in 2.23 in 3.38 in
225 yds -0.31 in 2235 fps 1631 fpe 0.275 sec 13.70 in 3.07 in 4.36 in
250 yds -2.15 in 2187 fps 1561 fpe 0.309 sec 17.18 in 4.04 in 5.47 in
275 yds -4.43 in 2139 fps 1493 fpe 0.344 sec 21.12 in 5.14 in 6.70 in
300 yds -7.17 in 2091 fps 1428 fpe 0.379 sec 25.52 in 6.38 in 8.05 ined

I just got some 163 gn M2 AP on E-bay. Any info on the BC on that round per chance? :)

NoNotAgain November 03, 2003 13:20

Hello Wiz

Try .435 BC for this projectile.

Below 2700 it drops to .408.

Normal velocity is listed for 30/06 @3000 fps

Pistolwiz November 04, 2003 00:15

Thanx again NNA! Not much difference between the two loads which is nice. Same 25 yard zero keeps it in MAT (Minute Angle of Torso) out to 300 yards on both loads even though I calculated the 163gn AP @ 2650fps. Downrange Zero is at 213 yards. Here's my data:

Name: .308 Cal, MILSURP AP, 163 grn
Ballistic Coeff: 0.408
Bullet Weight: 163
Velocity: 2650
Target Distance: 212
Scope Height: 1.500
Temperature: 70
Altitude: 500

Ballistic Data
~~~~~~~~~~~~~~~
Range Elevation Velocity Energy ETA Drop Max Y 10mph Wind Deflect
0 yds -1.50 in 2650 fps 2541 fpe 0.000 sec 0.00 in -1.50 in 0.00 in
25 yds -0.00 in 2597 fps 2442 fpe 0.029 sec 0.16 in -0.56 in 0.05 in
50 yds 1.17 in 2545 fps 2345 fpe 0.058 sec 0.63 in -0.44 in 0.19 in
75 yds 2.01 in 2494 fps 2251 fpe 0.088 sec 1.45 in -0.23 in 0.46 in
100 yds 2.51 in 2443 fps 2160 fpe 0.118 sec 2.60 in 0.07 in 0.77 in
125 yds 2.65 in 2393 fps 2072 fpe 0.148 sec 4.11 in 0.47 in 1.23 in
150 yds 2.40 in 2343 fps 1987 fpe 0.180 sec 6.02 in 0.98 in 1.82 in
175 yds 1.74 in 2294 fps 1905 fpe 0.213 sec 8.32 in 1.60 in 2.55 in
200 yds 0.67 in 2246 fps 1825 fpe 0.246 sec 11.05 in 2.34 in 3.42 in
225 yds -0.84 in 2198 fps 1748 fpe 0.280 sec 14.21 in 3.20 in 4.41 in
250 yds -2.79 in 2151 fps 1674 fpe 0.314 sec 17.81 in 4.20 in 5.52 in
275 yds -5.21 in 2104 fps 1602 fpe 0.350 sec 21.88 in 5.34 in 6.75 in
300 yds -8.10 in 2058 fps 1532 fpe 0.386 sec 26.42 in 6.63 in 8.09 in
325 yds -11.47 in 2012 fps 1465 fpe 0.422 sec 31.44 in 8.06 in 9.54 in
350 yds -15.42 in 1967 fps 1400 fpe 0.460 sec 37.04 in 9.68 in 11.20 in
375 yds -19.82 in 1922 fps 1337 fpe 0.498 sec 43.10 in 11.44 in 12.90 in
400 yds -24.87 in 1878 fps 1277 fpe 0.537 sec 49.80 in 13.42 in 14.83 in
425 yds -30.59 in 1835 fps 1219 fpe 0.578 sec 57.18 in 15.61 in 16.97 in
450 yds -37.01 in 1793 fps 1163 fpe 0.619 sec 65.24 in 18.03 in 19.32 in
475 yds -44.13 in 1752 fps 1110 fpe 0.662 sec 74.02 in 20.69 in 21.86 in
500 yds -51.99 in 1711 fps 1059 fpe 0.706 sec 83.53 in 23.60 in 24.57 in
525 yds -60.58 in 1671 fps 1011 fpe 0.750 sec 93.77 in 26.77 in 27.46 in
550 yds -69.93 in 1632 fps 964 fpe 0.796 sec 104.77 in 30.20 in 30.52 in
575 yds -80.05 in 1593 fps 919 fpe 0.843 sec 116.54 in 33.90 in 33.72 in
600 yds -90.94 in 1555 fps 875 fpe 0.890 sec 129.08 in 37.89 in 37.08 in
625 yds -102.61 in 1518 fps 834 fpe 0.938 sec 142.41 in 42.17 in 40.57 in
650 yds -115.45 in 1482 fps 795 fpe 0.988 sec 156.91 in 46.85 in 44.40 in
675 yds -129.17 in 1447 fps 757 fpe 1.039 sec 172.28 in 51.86 in 48.37 in
700 yds -144.09 in 1413 fps 722 fpe 1.092 sec 188.85 in 57.30 in 52.63 in
725 yds -160.21 in 1380 fps 689 fpe 1.145 sec 206.62 in 63.17 in 57.15 in
750 yds -177.52 in 1348 fps 658 fpe 1.201 sec 225.58 in 69.47 in 61.90 in
775 yds -196.02 in 1318 fps 629 fpe 1.257 sec 245.73 in 76.22 in 66.86 in
800 yds -215.70 in 1288 fps 601 fpe 1.315 sec 267.06 in 83.41 in 72.00 in


All times are GMT -5. The time now is 08:38.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
©1998-2012 The FAL Files