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  1. #1
    Join Date
    Nov 2010
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    South-Central Idaho
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    Default Tell Me I'm Crazy...The 6.5 Grendel Pistol

    I have an extra lower kicking around in the safe and have been wondering what to do with it.

    I thought about a 10.5" 5.56 pistol but I just can't get excited about the flash/bang or the ballistics. Besides, Gabe quit making them which made me grumpy.

    I thought about a 300 BLK rifle but I already have a pistol and a couple of AKs and .308 rifles so couldn't really see the point.

    Then I got to thinking about doing a 12.5" 6.5 Grendel pistol (with brace). I already have a rifle it could share mags with. I have ammo for it...hmmm.

    The ballistics ought to be much better than either 300 Blk or 5.56 from a short barrel. I'd guess 5 or 600 yards would be well within it's capability. 123 grain pills from a 12.5" barrel are still supersonic to something like 850 yards. It'd be short and handy and could wear a can without being ungainly. With a 1-4 optic, it seems like it could be the ultimate concealable mini carbine.

    Am I all wet on this?

    Doc
    Last edited by DogDoc; 02-21-2017 at 06:25 PM.
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  2. #2
    Join Date
    Nov 2008
    Posts
    838
    Other than cost of ammo it seems like a cool experiment. Once you add a can, it puts it in league with the other calibers in terms of noise, but it may well be quieter than supersonic 5.56.
    Have you run a ballistics table on it to check velocity and drop out of that barrel? I know 300 was optimized for short barrels and 9" is about ideal. With 12" of tube and 123 projectiles, not sure Grendel is going to be vastly superior. Curious to hear more....

  3. #3
    Join Date
    Nov 2010
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    South-Central Idaho
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    From some testing Dave Fortier did a few years ago:

    Alexander Arms 12.5 inch 6.5mm Grendel

    Alexander Arms 100 grain Berger OTM 2470
    Alexander Arms 123 grain Scenar OTM 2330
    Velocity figures are 10 shot averages recorded on an Oehler 35P placed 12 feet from the muzzle 1,030 feet above Sea Level at an ambient temperature of 30 degrees F.

    *Note the low temps with the 12.5 inch gun
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  4. #4
    Join Date
    Nov 2010
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    From Hornady's Ballistics Calculator:

    Your Input Variables


    Ballistic Coefficient 0.506 Velocity (ft/s) 2330 Weight (grains) 123
    Maximum Range (yds) 1000 Interval (yds) 100 Drag Function G1
    Sight Height (inches) 1.5 Shooting Angle (degrees) 0 Zero Range (yds) 100
    Wind Speed (mph) 0 Wind Angle (degrees) 90 Altitude (ft) 0
    Pressure (hg) 29.53 Temperature (F) 59 Humidity (%) 0.78
    Ballistics Results - 6.5 Grendel 12.5" Barrel

    RANGE(YARDS) VELOCITY(FPS) ENERGY(FT.-LB.) TRAJECTORY(IN) COME UP IN MOA COME UP IN MILS WIND DRIFT(IN) WIND DRIFT IN MOA WIND DRIFT IN MILS
    Muzzle 2330 1483 -1.5 0 0 0 0 0
    100 2168 1284 0 0 0 0 0 0
    200 2013 1107 -5.9 2.8 0.8 0 0 0
    300 1865 950 -20.4 6.5 1.9 0 0 0
    400 1725 812 -45 10.7 3.1 0 0 0
    500 1593 693 -81.2 15.5 4.5 0 0 0
    600 1470 590 -131.2 20.9 6.1 0 0 0
    700 1358 504 -197.3 26.9 7.8 0 0 0
    800 1258 432 -282.2 33.7 9.8 0 0 0
    900 1173 376 -389.1 41.3 12 0 0 0
    1000 1104 333 -521.5 49.8 14.5 0 0 0
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  5. #5
    Join Date
    Nov 2010
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    Compared to 5.56 55 grain from a 12" barrel (Couldn't find any 12" velocity numbers for a 75g):

    Your Input Variables

    Ballistic Coefficient .255 Velocity (ft/s) 2724 Weight (grains) 55
    Maximum Range (yds) 1000 Interval (yds) 100 Drag Function G1
    Sight Height (inches) 1.5 Shooting Angle (degrees) 0 Zero Range (yds) 100
    Wind Speed (mph) 0 Wind Angle (degrees) 90 Altitude (ft) 0
    Pressure (hg) 29.53 Temperature (F) 59 Humidity (%) 0.78
    Ballistics Results - 5.56 12" Barrel

    RANGE(YARDS) VELOCITY(FPS) ENERGY(FT.-LB.) TRAJECTORY(IN) COME UP IN MOA COME UP IN MILS WIND DRIFT(IN) WIND DRIFT IN MOA WIND DRIFT IN MILS
    Muzzle 2724 906 -1.5 0 0 0 0 0
    100 2380 692 0 0 0 0 0 0
    200 2062 519 -4.7 2.2 0.6 0 0 0
    300 1771 383 -17.6 5.6 1.6 0 0 0
    400 1512 279 -41.7 10 2.9 0 0 0
    500 1293 204 -81.2 15.5 4.5 0 0 0
    600 1128 156 -141.5 22.5 6.5 0 0 0
    700 1020 127 -229.1 31.2 9.1 0 0 0
    800 945 109 -350.2 41.8 12.2 0 0 0
    900 886 96 -510.1 54.1 15.7 0 0 0
    1000 837 86 -714.5 68.2 19.8 0 0 0
    Last edited by DogDoc; 02-21-2017 at 06:43 PM.
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  6. #6
    Join Date
    Mar 2004
    Location
    OK
    Posts
    1,194
    Looks like it compares more to 300blk
    Every normal man must be tempted at times to spit upon his hands, hoist the black flag, and begin slitting throats.

    H. L. Mencken

  7. #7
    Join Date
    Jan 2012
    Location
    NW Washington
    Posts
    2,909
    Gotta say DogDoc, those numbers are hard to argue with. Seems like a relatively easy itch to scratch, if ya don't like it you're only a barrel and bolt change from something else. I might have to give this one some more thought myself.

  8. #8
    Join Date
    May 2011
    Posts
    953
    Interesting, I'm a bit curious about 6.5 Grendel for killing pigs further away than I want to try with 5.56/300 blk and was just discussing its SBR potential with an enthusiast. I've got a great standing offer to buy a friend's 6.8 SPC SBR that I covet and determined that 6.5 G doesn't make better sense for my purposes (increasing my range from 150-200 yards out to more like 350 yards) as 6.5 G starts to really outperform 6.8 somewhere past 400-450 yards.

    But for the DMR pistol role someone wrote about here recently, 6.5 Grendel seems perfect.

    I think 6.5 G out of a 12.5" will be almost as unpleasant as 5.56 out of a 10.5" and will scream for a suppressor.

  9. #9
    Join Date
    Feb 2007
    Posts
    2,123
    Quote Originally Posted by khadga View Post
    ... I think 6.5 G out of a 12.5" will be almost as unpleasant as 5.56 out of a 10.5" and will scream for a suppressor.
    A flash can style muzzle brake helps quite a bit with redirecting the muzzle blast forward. I used a STD (Simple Threaded Devices) on my 10.5" 5.56 before I got a suppressor. It made a big difference. Other styles like the KAK should also work.
    Making the bad man go away since 1982.

  10. #10
    Join Date
    Mar 2012
    Location
    Arizona
    Posts
    586
    For the best Grendel info around check out the 6.5 Grendel forum.
    http://www.65grendel.com/forum/forum.php
    There are topics for hunting, NFA and all things Grendel. My favorite caliber for all round performance.

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