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300 Ham’r ... anyone?

Discussion in 'Rifle Country' started by kimberkid, Mar 9, 2019.

  1. kimberkid

    kimberkid Member

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    A buddy at work was asking me about it, he was going to switch out an M4 ... it was slow so we googled it, it’s like the 300 Blackout except it uses a full length 223 case and the heaviest bullet it can use a 150 ... I think a 125 would only do a little over 2200 FPS.

    We decided it was the answer to an unasked question

    Edit to add, it’s an 18” barrel barrel so the hand guard and gas tube would have been too short to fit as M4 was an older carbine ... I’m not sure if it was set up to be a mid or rifle length gas system
     
  2. <*(((><
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    <*(((>< Luke

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    7.62x39
     
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  3. mcb

    mcb Member

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    It's basically 300 BO that sacrifices the ability to shoot heavy subsonic loads for a small boost in supersonic performance with mid to light bullets.
     
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  4. adcoch1

    adcoch1 Member

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    I could be wrong but I don't believe the case is 45mm long, otherwise no 30 cal bullet would fit at mag length in an AR
     
  5. LRDGCO

    LRDGCO member

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    The 300 HAMR case is .23" longer than the 300 BO so not a full sized 223 case. It will take bullets up to 150 grs, but the 150s were doing 2,200 fps out of an 18" barrel in an article in Handloader ( Feb '19) It looks like 130s at 2,600 would be the ticket. The article tried to make it out as the "30-30 AR" but it seems more like the U.S. 7.62 x 39. Useful for piggies, I guess.
     
  6. someguy2800

    someguy2800 Member

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    I think it’s a neat looking hunting cartridge but it’s vying for space with other that came before it and do the exact same thing. Since the introduction of CFE BLK powder and reliable magazines for 7.62x39 AR15’s this one really doesn’t have much room to make a niche for itself. If you really want more oomph than a 7.62x39 in a 30 caliber AR15 wildcat, I would look at a 30 Sabercat.
     
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  7. cat_IT_guy

    cat_IT_guy Member

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    I'm all for companies and individuals trying out new cartridges, makes for good reading material. I read about this one, and having experience with 300 blackout, I suppose it has a small place - 30 Cal ar, minimal parts to change out (barrel only I think), easy to make brass from readily available 223, and relatively mild recoil. Should be all right for deer at reasonable range, but a bit pricey due to 30 Cal bullets for high volume plinking.

    So as others have said, keep on innovating, but 30 Cal is a crowded space. I'd love to try one out, but don't see a place in my safe for one any time soon, barring a too good to pass up deal.
     
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  8. CarJunkieLS1

    CarJunkieLS1 Member

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    Don't forget the 30 cal AR-15 cartridge that fell by the wayside because of Remingtons idiocy...the 30 Rem AR. I have one and love it, definite step up from 300blk or 7.62x39 but rifles are impossible to find and so is ammo.

    I find myself using the 7.62x39 more and more. Accurate, shoots cheap ammo, and my reloads for hunting are very effective in deer size game.
     
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  9. someguy2800

    someguy2800 Member

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    I would buy one in a second if it wasn’t a unicorn and if brass was easily made
     
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  10. CoalTrain49

    CoalTrain49 Member

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    The 300 Ham'r is a mighty nice cartridge. So is the 6.8 SPC, Grendel and 357 Legend.

    The field is getting mighty jammed up with AR length cartridges.

    It's like trying to decide what to order in a Chinese restaurant.
     
  11. mcb

    mcb Member

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    I would take 350 Legend over 300 Ham'R any day of the week.
     
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  12. CoalTrain49

    CoalTrain49 Member

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    That's my criteria. Can I make a case using 223/5.56. I almost bought a 300 BLK but it's a tweener. The chamber throats are hellacious long and twist is way too fast for lighter bullets. Still waiting.
     
  13. GBExpat

    GBExpat Member

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    Ayup ... a(nother) solution to a non-existent problem.
     
  14. CoalTrain49

    CoalTrain49 Member

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    Of those four Legend would be my choice also. I think it has a decent chance of becoming a mainstream cartridge because of hunting regs in some states.:cool:
     
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  15. mcb

    mcb Member

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    I have shot 10 shoot groups at 260 yards that where nearly 1 MOA. Using 110gr bullets in a 1: 7 twist 16 inch barrel. That same barrel does just fine with 220gr bullets at subsonic velocities.
     
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  16. CoalTrain49

    CoalTrain49 Member

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    What rifle?
     
  17. someguy2800

    someguy2800 Member

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    If it still shoots 110 and 125 grain bullets sub MOA then is the twist really too fast and the throat too long? Mine does.
     
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  18. <*(((><
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    <*(((>< Luke

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    I too wish the 30 Rem AR was mainstream it is a potent round. Chalk another one up to Remingtons inability to market.
     
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  19. ExAgoradzo

    ExAgoradzo Member

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    Agreed.
    And call me lame, but the market has more like me, I want something with a little broader ability.
    So by all means keep making weird stuff...one of them might be the magical unicorn that farts rainbows...oh wait, that’s the .308 Win...
    Grrg
     
  20. js8588

    js8588 Member

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    This
     
  21. mcb

    mcb Member

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    Built from parts.
     
  22. mcb

    mcb Member

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    No doubt Remington is to blame to some degree for the early demise of 30 Rem AR. But at the same time that is one bastard of an AR upper. It's a unique upper, unique barrel extension, unique bolt, unique magazine. Other than working on an AR lower it's nearly all new parts in the upper. Unlike 300 BO, 300 Ham'r that only require a new barrel
     
  23. <*(((><
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    <*(((>< Luke

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    Specialty upper doesn’t bother me in the least if the performance is there. Maintain compatibility with a serialized AR15 lower is the key.
     
  24. mcb

    mcb Member

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    I agree, it doesn't bother me either but for allot of people it is a negative not a positive feature and hurt it's market acceptance. Personally I wish they would have used the oversized bolt and barrel extension of 30 Rem AR with it's parent case, 450 Bushmaster. Imagine 450 Bushmaster at 55 ksi like 30 Rem AR instead of 38.5ksi.
     
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  25. kimberkid

    kimberkid Member

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    I have a review from another forum I frequent, pretty much tells me all I need to know;

    Also

     
    Last edited: Mar 10, 2019
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