Originally posted by woohoo
View Post
As it stands, that a 130gr at 2585fps with a .550 BC over-takes the .311 147.8gr 7.62x54R at 2750fps by 150yds for speed, and matched energy by 275yds. Trajectory and wind drift are significantly less, as is recoil and soldier's load. I consider this over-match, especially since we use belt-feds for busting through barriers in MOUT, and picking up where the carbines leave off in open terrain, while also being used in blocking positions to interdict vehicles.
130gr 6.5mm with .550 BC
Code:
Range Velocity Energy Trajectory TOF Drift (yards) (fps) (ft-lb) (MILS) (sec) (MILS) 0 2585 1929 0.00 0.0000 0.00 25 2544 1868 -1.51 0.0292 -0.05 50 2504 1809 -0.31 0.0590 -0.09 75 2464 1752 -0.04 0.0891 -0.14 100 2424 1696 -0.00 0.1198 -0.19 125 2385 1642 -0.06 0.1510 -0.23 [B]150 2346[/B] 1589 -0.17 0.1827 -0.28 175 2307 1537 -0.31 0.2150 -0.33 200 2269 1486 -0.48 0.2477 -0.38 225 2231 1437 -0.65 0.2811 -0.43 250 2194 1389 -0.85 0.3150 -0.49 [B]275 2157[/B] [B]1343[/B] -1.05 0.3494 -0.54 300 2120 1297 -1.26 0.3845 -0.59 300 2120 1297 -1.26 0.3845 -0.59 350 2048 1210 -1.71 0.4565 -0.70 400 1977 1128 -2.19 0.5310 -0.82 450 1907 1050 -2.70 0.6083 -0.94 [B] 500 1839 977 -3.24 0.6884 -1.06[/B] 550 1773 908 -3.82 0.7714 -1.19 600 1709 843 -4.42 0.8576 -1.32 650 1646 782 -5.06 0.9470 -1.45 700 1586 726 -5.74 1.0399 -1.59 [B]750 1527 673 -6.45 1.1363 -1.74[/B] 800 1471 624 -7.20 1.2364 -1.88 850 1417 579 -8.00 1.3403 -2.04 900 1366 538 -8.84 1.4482 -2.20 950 1317 501 -9.73 1.5601 -2.36 [B]1000 1272 467 -10.67 1.6761 -2.52[/B] 1050 1229 436 -11.66 1.7961 -2.69 1100 1190 409 -12.71 1.9202 -2.86 1150 1154 384 -13.82 2.0483 -3.04 [B]1200 1121 363 -14.98 2.1803 -3.21 still supersonic[/B] 1250 1092 344 -16.20 2.3160 -3.39 1300 1066 328 -17.49 2.4552 -3.56 1350 1042 313 -18.84 2.5977 -3.74 1400 1020 301 -20.25 2.7434 -3.91
Code:
Range Velocity Energy Trajectory TOF Drift (yards) (fps) (ft-lb) (MILS) (sec) (MILS) 0 2750 2485 0.00 0.0000 0.00 25 2679 2358 -1.56 0.0276 -0.07 50 2608 2236 -0.34 0.0560 -0.14 75 2539 2119 -0.05 0.0852 -0.22 100 2471 2006 -0.00 0.1151 -0.29 125 2404 1899 -0.05 0.1459 -0.37 150 [B]2338[/B] 1796 -0.15 0.1775 -0.45 175 2273 1698 -0.29 0.2100 -0.54 200 2209 1604 -0.45 0.2435 -0.62 225 2146 1514 -0.63 0.2779 -0.71 250 2085 1428 -0.82 0.3134 -0.80 [B] 275 2024 [/B] [B]1346[/B] -1.03 0.3499 -0.89 300 1964 1267 -1.26 0.3875 -0.98 325 1905 1193 -1.50 0.4263 -1.08 350 1848 1122 -1.75 0.4663 -1.18 375 1792 1055 -2.01 0.5075 -1.28 400 1736 991 -2.29 0.5500 -1.39 425 1683 930 -2.59 0.5939 -1.50 450 1630 873 -2.90 0.6392 -1.61 475 1579 820 -3.22 0.6859 -1.73 [B] 500 1530 769 -3.56 0.7342 -1.85[/B] 525 1482 722 -3.92 0.7840 -1.97 550 1436 677 -4.29 0.8354 -2.09 575 1391 636 -4.68 0.8885 -2.22 600 1349 598 -5.09 0.9432 -2.35 625 1308 562 -5.53 0.9997 -2.49 650 1270 530 -5.98 1.0579 -2.63 675 1234 500 -6.45 1.1178 -2.76 700 1200 473 -6.95 1.1795 -2.91 725 1169 449 -7.47 1.2428 -3.05 [B]750 1140 427 -8.02 1.3078 -3.19[/B] [B][COLOR="red"]775 1113 407 -8.59 1.3744 -3.34[/COLOR][/B][B]subsonic[/B] 800 1089 390 -9.18 1.4426 -3.48 825 1066 374 -9.80 1.5122 -3.63 850 1046 360 -10.45 1.5833 -3.78 875 1027 347 -11.12 1.6557 -3.92 900 1010 335 -11.82 1.7293 -4.06 925 993 324 -12.55 1.8043 -4.21 950 978 314 -13.30 1.8804 -4.35 975 963 305 -14.08 1.9578 -4.49 [B]1000 949 296 -14.88 2.0363 -4.62[/B] 1025 936 288 -15.71 2.1159 -4.76 1050 924 280 -16.57 2.1967 -4.90 1075 912 273 -17.45 2.2785 -5.03 1100 900 266 -18.36 2.3614 -5.16 1125 889 260 -19.29 2.4454 -5.30 1150 879 254 -20.25 2.5304 -5.43 1175 869 248 -21.24 2.6164 -5.56 1200 859 242 -22.25 2.7035 -5.68 1225 849 237 -23.29 2.7916 -5.81 1250 839 231 -24.35 2.8807 -5.94 1275 830 226 -25.44 2.9708 -6.06 1300 821 222 -26.56 3.0620 -6.18 1325 812 217 -27.70 3.1541 -6.31 1350 804 212 -28.87 3.2473 -6.43 1375 795 208 -30.06 3.3416 -6.55 1400 787 204 -31.28 3.4368 -6.67
With that load, I'm supersonic out to 1200yds, and they are subsonic by 775yds.
Comment