Grendel vs 308

[LRRPF52]

From the shooter perspective in my case in the same shooting area and almost identical conditions, I have made similar shots with both the .308 22" bolt gun spitting 175gr SMK's (1118yds), and 123gr A-MAX from my 16" AR15 carbine (1200yds).

Bryan Litz put out an extensive series of articles, as well as two excellent books on long range applied ballistics, and he valued the G7 model for the 175gr SMK at .243

iSnipe lists the 123gr A-MAX at .256

Atmospherics and temps are the same for the following comparisons, basically sea level at 59 F. .308 will almost always have an energy advantage if comparing bullets with similar BC's shot at the same speeds. Hornady's 9th shows 2500fps as max for a 22" bolt gun .308 with 178gr, and 2500fps with the 123gr 6.5mm from an 18" Grendel, considering that the 120gr GMX limited them in the speeds due to start pressure of a solid and its longer bearing surface.

What I get out of this is that my supersonic reach is a bit farther, my powder consumption is significantly less, recoil is around half, and the Grendel works out of an AR15, purpose-built for an AR15. When I was shooting .308, I only hand-loaded since I was shooting gas guns, and the 168gr sucks as a long range bullet, whereas the 175gr loads are optimized for bolt guns with no gas system.

6.5 Grendel 123gr A-MAX at 2500fps mv

Code:

Range Velocity Energy Trajectory TOF Drift (yards) (fps) (ft-lb) (MILS) (sec) (MILS) 0 2500 1707 0.00 0.0000 0.00 50 2414 1592 -0.00 0.0611 -0.10 100 2330 1483 0.00 0.1243 -0.21 150 2247 1379 -0.30 0.1898 -0.32 200 2167 1282 -0.68 0.2578 -0.44 250 2088 1190 -1.12 0.3283 -0.56 300 2010 1103 -1.60 0.4015 -0.68 350 1934 1022 -2.11 0.4776 -0.81 400 1860 944 -2.65 0.5567 -0.94 450 1786 871 -3.23 0.6390 -1.08 [B]500 1715 803 -3.85 0.7247 -1.22[/B] 550 1644 738 -4.50 0.8140 -1.37 600 1575 677 -5.19 0.9072 -1.53 650 1507 620 -5.93 1.0046 -1.69 700 1440 567 -6.71 1.1064 -1.86 750 1375 517 -7.54 1.2130 -2.04 [B]800 1312 470 -8.43 1.3247 -2.23[/B] 850 1250 427 -9.38 1.4419 -2.43 900 1190 387 -10.40 1.5649 -2.64 [B]950 1134 351 -11.48 1.6941 -2.85[/B] 1000 1087 323 -12.65 1.8294 -3.08 1050 1056 305 -13.90 1.9697 -3.31 1100 1032 291 -15.24 2.1135 -3.53 1150 1012 280 -16.65 2.2604 -3.75 1200 994 270 -18.15 2.4102 -3.96

.308 175gr SMK at 2500fps mv

Code:

Range Velocity Energy Trajectory TOF Drift (yards) (fps) (ft-lb) (MILS) (sec) (MILS) 0 2500 2429 0.00 0.0000 0.00 50 2410 2256 -0.00 0.0611 -0.11 100 2321 2093 -0.00 0.1245 -0.22 150 2234 1940 -0.30 0.1904 -0.34 200 2150 1795 -0.69 0.2588 -0.46 250 2067 1660 -1.13 0.3300 -0.59 300 1986 1532 -1.62 0.4040 -0.72 350 1906 1412 -2.14 0.4811 -0.86 400 1828 1298 -2.69 0.5615 -1.00 450 1752 1192 -3.29 0.6453 -1.15 [B]500 1677 1092 -3.92 0.7328 -1.30[/B] 550 1603 999 -4.59 0.8243 -1.46 600 1531 911 -5.31 0.9200 -1.63 650 1460 829 -6.08 1.0204 -1.81 700 1391 752 -6.90 1.1256 -2.00 750 1324 681 -7.77 1.2361 -2.19 [B]800 1259 616 -8.71 1.3523 -2.40[/B] 850 1196 555 -9.72 1.4746 -2.62 [B]900 1136 501 -10.80 1.6034 -2.85[/B] 950 1086 458 -11.97 1.7387 -3.08 1000 1054 432 -13.22 1.8791 -3.32 1050 1029 412 -14.56 2.0232 -3.56 1100 1009 395 -15.99 2.1706 -3.78 1150 990 381 -17.50 2.3209 -4.00 1200 972 367 -19.09 2.4740 -4.22