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Im looking to build a uber long range AR, 20-22in barrel. I have already bought all the parts Ive wanted in the build, all in FDE or to be cerakoted later. An Aero M4E1 receiver set, Rubber CIty lightweight bolt carrier, SSA-E trigger, Fab RAPS stock. I was set on 6 ARC after talking to some PRS shooters at the Phoenix rod and gun club, but the more research i do, the less attractive it seems.
For one, Hornady is the only company supporting this round. As impressive as it is, the cheapest ammo is going to be $1.25cpr, Grendel can be had for half. There is far more third party support for Grendel. Finally, when you compare grain for grain, there is nearly no advantage to a similarly loaded Grendel round. Here is some data i found on 65grendel.com:
For one, Hornady is the only company supporting this round. As impressive as it is, the cheapest ammo is going to be $1.25cpr, Grendel can be had for half. There is far more third party support for Grendel. Finally, when you compare grain for grain, there is nearly no advantage to a similarly loaded Grendel round. Here is some data i found on 65grendel.com:
12? 6mm ARC
6mm 108gr ELD-M, 2350fps hand load with CFE223 or LeverEvolution, 23.8? Hg (higher altitude/lower air density where I shoot a lot), 59 deg F
300yds 1981fps 941ft-lbs 1.4 mil drop .5 drift
600yds 1643fps 647ft-lbs 5.0 mils / 1.1 drift
800yds 1437fps 495ft-lbs 8.1 / 1.6
1000yds 1270fps 387ft-lbs 11.3 / 2.0
1150yds 1118fps 300ft-lbs 15.2 / 2.6
1200yds 1085fps 283ft-lbs 16.4 / 2.7
12? 6.5 Grendel
107gr SMK, .230 G7 BC model, 2475fps hand load with IMR 8208XBR (~ 49,000psi), 23.8? Hg, 59 deg F
300yds 2053fps 1001ft-lbs 1.4 / 0.6
600yds 1673fps 665ft-lbs 4.7 / 1.3
800yds 1441fps 494ft-lbs 7.7 / 1.8
1000yds 1225fps 356ft-lbs 11.3 / 2.5
1150yds 1099fps 287ft-lbs 14.6 / 3.1
1200yds 1077fps 276ft-lbs 15.9 / 3.2
6mm 108gr ELD-M, 2350fps hand load with CFE223 or LeverEvolution, 23.8? Hg (higher altitude/lower air density where I shoot a lot), 59 deg F
300yds 1981fps 941ft-lbs 1.4 mil drop .5 drift
600yds 1643fps 647ft-lbs 5.0 mils / 1.1 drift
800yds 1437fps 495ft-lbs 8.1 / 1.6
1000yds 1270fps 387ft-lbs 11.3 / 2.0
1150yds 1118fps 300ft-lbs 15.2 / 2.6
1200yds 1085fps 283ft-lbs 16.4 / 2.7
12? 6.5 Grendel
107gr SMK, .230 G7 BC model, 2475fps hand load with IMR 8208XBR (~ 49,000psi), 23.8? Hg, 59 deg F
300yds 2053fps 1001ft-lbs 1.4 / 0.6
600yds 1673fps 665ft-lbs 4.7 / 1.3
800yds 1441fps 494ft-lbs 7.7 / 1.8
1000yds 1225fps 356ft-lbs 11.3 / 2.5
1150yds 1099fps 287ft-lbs 14.6 / 3.1
1200yds 1077fps 276ft-lbs 15.9 / 3.2
