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Thread: 6.5 Grendel VS 300 AAC?

  1. #1
    recon562001
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    6.5 Grendel VS 300 AAC?

    I have been looking at the numbers and the AAC shoots a 125 grain 7.62 projectile at 2250 FPS producing 1405 foot ponds out of a 16 inch barrel while the Grendel shoots a 123 grain at 2650 FPS producing 1917 foot pounds from a 24 inch barrel.

    To me that seems that if I am using the Grendel in a 16 inch barrel that I am going to be getting about the same performance from either round. Dose that seem to be the case to any one else?

    I know there are quite a few guys on here that know much more about these things then I do so any input y'all have would be helpful.

  2. #2
    Chieftain Drifter's Avatar
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    Run the data through a trajectory calculator, such as the JBM Ballistics website. I think you'll find that a 6.5 123gr bullet at ~2400 to 2450 fps from a 16" barrel will have more energy and flatter trajectory versus a .30 caliber 123gr at 2250.

    I think the 300 AAC might have been designed for suppressor use, and / or use with subsonic ammo, but I could be wrong.

    What would be the intended use of the cartridge(s) for you?
    Drifter

  3. #3
    Moderator bwaites's Avatar
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    Intended use here is a critical decision.

    The AAC was developed for use as a suppressed round for short ranges, say, 200 yards or less and was really targeted and designed as a subsonic round.

    The Grendel is a multipurpose round, and useful at much greater ranges.
    Gun Confiscation WILL NOT Happen In My Lifetime. Pat Kelley 1998

    NOR IN MINE!

  4. #4
    Chieftain BjornF16's Avatar
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    I have a Noveske 10.5" 300 BLK bolt/barrel/upper receiver with Troy Extreme handguard. I really enjoy shooting this rig. I'm still awaiting my YHM suppressor so I don't know how it shoots suppressed. After some testing, I'll decide whether or not to make this my home defense rig.

    Here is what the AAC website says:

    DESIGN OBJECTIVES
    • Create a reliable compact 30-cal solution for the AR platform
    • Utilize existing inventory magazines while retaining their full capacity
    • Create the optimal platform for sound and flash suppressed fire
    • Create compatible supersonic ammo that matches 7.62x39 ballistics
    • Provide the ability to penetrate barriers with high-mass projectiles
    • Provide all capabilities in a lightweight, durable, low recoiling package

    9" Ballistics:
    @ Muzzle:
    5.56mm, M855 2558 ft/s, 901 ft-lb
    300 BLK, 155 gr SMK 1785 ft/s, 1096 ft-lb (22% over 5.56mm)
    7.62x39mm, 123 gr* 2022 ft/s. 1117 ft-lb
    6.8 SPC, Hornady TAP 110* 2157 ft/s. 1136 ft-lb

    300 BLK, 123gr MC 2130 ft/s, 1238 ft-lb (37% over 5.56mm, 9% over 6.8 SPC TAP 110)

    Björn


  5. #5
    recon562001
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    I was thinking about making a scout style rifle that could also be suppressed but I think I am going to step up to the 6.5 Creedmoor so I have a light weight general purpose rifle capable of taking game up to elk.

    And no I am not going to use the suppressor for hunting I just want one because I am an American and I can.

  6. #6
    JASmith
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    Quote Originally Posted by recon562001 View Post
    I have been looking at the numbers and the AAC shoots a 125 grain 7.62 projectile at 2250 FPS producing 1405 foot ponds out of a 16 inch barrel while the Grendel shoots a 123 grain at 2650 FPS producing 1917 foot pounds from a 24 inch barrel.

    To me that seems that if I am using the Grendel in a 16 inch barrel that I am going to be getting about the same performance from either round. Dose that seem to be the case to any one else?
    Alexander Arms (http://www.alexanderarms.com/) has a downloadable sheet of ballistics for a variety of barrel lengths. Their sheet lists the 123 gr Scenar as having a muzzle velocity of 2480 ft/sec from a 16" barrel.

    And yes, Drifter has it right -- Your 123 Grendel bullet starting 200 ft/sec faster will outshine the 125 gr 7.62 projectile in just about any category you can think of! (Except for cost of ammo!)

  7. #7
    Moderator bwaites's Avatar
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    Quote Originally Posted by JASmith View Post
    Alexander Arms (http://www.alexanderarms.com/) has a downloadable sheet of ballistics for a variety of barrel lengths. Their sheet lists the 123 gr Scenar as having a muzzle velocity of 2480 ft/sec from a 16" barrel.

    And yes, Drifter has it right -- Your 123 Grendel bullet starting 200 ft/sec faster will outshine the 125 gr 7.62 projectile in just about any category you can think of! (Except for cost of ammo!)
    Have you priced that 300 AAC ammo? There ain't no cheap stuff I've found. Comparable to, or even higher, than Grendel ammo.
    Gun Confiscation WILL NOT Happen In My Lifetime. Pat Kelley 1998

    NOR IN MINE!

  8. #8
    JASmith
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    Quote Originally Posted by bwaites View Post
    Have you priced that 300 AAC ammo? There ain't no cheap stuff I've found. Comparable to, or even higher, than Grendel ammo.
    OK Bill, ya got me again! I was thinking of all that cheap 7.62X39 stuff. The velocity was about right for it too.

    Cheers!

  9. #9
    LRRPF52
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    Quote Originally Posted by recon562001 View Post
    I was thinking about making a scout style rifle that could also be suppressed but I think I am going to step up to the 6.5 Creedmoor so I have a light weight general purpose rifle capable of taking game up to elk.

    And no I am not going to use the suppressor for hunting I just want one because I am an American and I can.
    The Creedmor will force you to move up to a larger action like the AR10. If you're going to do that, you might as well go .260 Rem and get a little more velocity, plus way more brass source options. Lightweight will be difficult to achieve though, since the AR10 action is much larger. Sure, you can profile down the barrel into a pencil, and use skeletonized stocks, but that pipe will heat-up really quick, and won't be fun to shoot so much, unless you use a deafening brake. This is why the Grendel makes a lot of sense:

    * You can have a heavier barrel, and still have a light gun
    * You can shoot it all day long, gaining more proficiency with it.
    * You can suppress it and still have a lower-profile gun
    * While not your first large game choice, the Grendel has successfully taken Elk out to 405 yards.

    Another cartridge to look at is the 6.5x47 Lapua, but that puts you back into AR10 action territory again. You have to prioritize what you want to do with your rifle, and take it from there. The .300 Whisper is a totally different animal than the Grendel, with a totally different purpose: Run extremely quiet with higher BC bullets at the threshold of subsonic flight within a limited range.

  10. #10
    Chieftain BjornF16's Avatar
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    I was thinking about making a scout style rifle that could also be suppressed but I think I am going to step up to the 6.5 Creedmoor so I have a light weight general purpose rifle capable of taking game up to elk.
    Grendel v Blackout...go with Grendel.

    I have two Grendel hunting guns. They are more than adequate for elk.

    Blackout would better applied to suppressed home defense (not that the Grendel is not adequate for that as well).

    260 Rem is a good choice for hunting as well.

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