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Thread: 6.5 Grendel bbl length?

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    Default 6.5 Grendel bbl length?

    Looking to maybe grab an upper for my boy to shoot deer with. Anyone shoot a 16” barrel on theirs? As small as he is, I kind of figure that a 16” would be easier for him to manage.


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    Man and other animals were first vegetarians; then Noah and his sons were given permission to eat meat: “every moving thing that liveth shall be meat for you” Genesis 9:3

    "A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold

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    I have two a 14 and 16 and are both are very similar in speed and easy to handle

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    Mine is 16". I almost always shoot it with a can but it's still manageable length. I think it's a great deer rifle. Damn accurate and plenty oomph out to longer ranges than most folks will ever shoot. I get a shade over 2400 fps with factory ammo in 123gr SST.

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    I shoot an 18" and have been very happy.

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    If I was buying it just for me, I’d go 20” barrel. Sounds like a 16” will tip deer over just fine though.


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    Man and other animals were first vegetarians; then Noah and his sons were given permission to eat meat: “every moving thing that liveth shall be meat for you” Genesis 9:3

    "A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold

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    Get one of those 12.5’s and put one of those brace thing a ma jiggers on it thats all over the news. 47 million other real Americans did it and told the govt to pound sand. They wont lock up little quackaddict
    "Eventually, all things merge into one, and a river runs through it. The river was cut by the world's great flood and runs over rocks from the basement of time. On some of the rocks are timeless raindrops. Under the rocks are the words, and some of the words are theirs.
    I am haunted by waters" Norman Maclean.

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    Something to consider is threshold expansion velocity. This varies with bullet design but is typically around 1800 fps for typical “soft” bullets such as Ballistic Tips and Gamekings. Note this does not mean full expansion at that velocity….just partial expansion. Obviously it also depends on what the bullet strikes as to how much it will expand. Some designs such as 30-30 bullets have thinner jackets and are designed to expand at much lower velocities. The purpose of expansion is to transfer energy to surrounding tissue by decelerating quickly in a relatively short distance. Frontal diameter from expansion is an important parameter in the transfer of energy.

    I have a Labradar that measures velocity out to 100 yards and beyond. Typical velocity drop at 100 yards is around 200-250 fps depending on a number of variables.

    You can do the math but for the Grendel to do its thing beyond a couple hundred yards means that it needs as much velocity as you can get away with. This usually means a longer barrel or bullets designed for lower velocities. I once called Nosler about the Accubond LR which advertises a low threshold expansion velocity. I was informed that only applied to certain LR bullets but the tech didn’t say which ones. ????
    Last edited by CWPINST; 07-10-2023 at 06:40 PM.
    If it ain\'t accurate at long distance, then the fact that it is flat shooting is meaningless.

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    Quote Originally Posted by CWPINST View Post
    Something to consider is threshold expansion velocity. This varies with bullet design but is typically around 1800 fps for typical “soft” bullets such as Ballistic Tips and Gamekings. Note this does not mean full expansion at that velocity….just partial expansion. Obviously it also depends on what the bullet strikes as to how much it will expand. Some designs such as 30-30 bullets have thinner jackets and are designed to expand at much lower velocities. The purpose of expansion is to transfer energy to surrounding tissue by decelerating quickly in a relatively short distance. Frontal diameter from expansion is an important parameter in the transfer of energy.

    I have a Labradar that measures velocity out to 100 yards and beyond. Typical velocity drop at 100 yards is around 200-250 fps depending on a number of variables.

    You can do the math but for the Grendel to do its thing beyond a couple hundred yards means that it needs as much velocity as you get away with. This usually means a longer barrel.
    This will be a 200 yard and in type of rig.


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    Man and other animals were first vegetarians; then Noah and his sons were given permission to eat meat: “every moving thing that liveth shall be meat for you” Genesis 9:3

    "A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold

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    Quote Originally Posted by Phone Man View Post
    Get one of those 12.5’s and put one of those brace thing a ma jiggers on it thats all over the news. 47 million other real Americans did it and told the govt to pound sand. They wont lock up little quackaddict
    I thought about going short, but of the rare occasion I forget my ear plugs, I don’t want that short ass little thing ruining what’s left of my hearing.


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    Man and other animals were first vegetarians; then Noah and his sons were given permission to eat meat: “every moving thing that liveth shall be meat for you” Genesis 9:3

    "A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold

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    Quote Originally Posted by JBtflo View Post
    Well that pretty much lines up with my “bubba” minimum expansion threshold velocity of 2200 fps for acceptable expansion. This means around 300 yards with a .308 and 150 gr ProHunters.
    If it ain\'t accurate at long distance, then the fact that it is flat shooting is meaningless.

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    Quote Originally Posted by quackaddict View Post
    I thought about going short, but of the rare occasion I forget my ear plugs, I don’t want that short ass little thing ruining what’s left of my hearing.


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    They make cans for that.
    Quote Originally Posted by ecu1984 View Post
    Steelin' Ducks is the KRT of suppressors and such.

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    Look into the 350 legend.

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    My Grendel has a 16” barrel. I shoot 129 ABLR. With the barrel length and ballistics I am confident with the bullet expansion threshold anywhere I will be hunting around here.
    Vegetarian: Native American for Piss Poor Hunter

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    FWIW I sold my Grendel. I have brass and bulllets if any of you reload. PM me.

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    PM sent.

  17. #17
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    I have been shooting a Grendel built around a Larue upper with an 18" barrel for a while now, with good results. I wouldn't go any shorter to keep velocities up. The load it likes best is the Alexander Arms ammo built on the 129 grain SST.
    "Only accurate rifles are interesting " - Col. Townsend Whelen

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