new AR caliber idea?

new AR caliber idea?

This is a discussion on new AR caliber idea? within the Defensive Rifles & Shotgun Discussion forums, part of the Related Topics category; So the thread about sub guns and their current relevance got me thinking. i started diggin through the realoding manual and i found this. 7mm ...

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  1. #1
    Distinguished Member Array DingBat's Avatar
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    new AR caliber idea?

    So the thread about sub guns and their current relevance got me thinking.
    i started diggin through the realoding manual and i found this.

    7mm Remington BR

    based on a .308 case, shortened with a steep shoulder.

    the cartridge over-all length is just 1/10 longer than a .223. so it would fit in a standard AR mag with a new follower. it's as fat as a .308 though, so it would require a dedicated bolt along with a new barrel, OR, the case could be modified to a rebated rim (a la .50 beo) and we could call it a new round.

    the round was developed for silhouette pistol, and all the test data i have is from a 10" barrel.
    they also have a section for .223 pistol, but it's for a 14"" barrel!

    so:
    the 7mm rem BR will fling a 145 gr BT Spitzer @ 2373 fps. that charts too 1,702 ft/lbs at the muzzle, with 6.1" drop @ 200 yds with a 100yd zero. and it still has 1,258 ft/lbs at 200 yds.

    the .223 will fling a 52 gr HP-match @ 3083 fps. that charts to 1,038 ft/lbs @ muzzle, with 3.6" drop at 200 w/100 zero. the .223 in this instance only has 596.4 ft/lbs left at 200 in this instance.

    ...so 75% more energy, for 3" more drop at 200 yds, out of a 4" shorter barrel? this sounds like a winner in the sub-gun "range" to me. i like the idea of a "sub-gun" that can effectively reach to 200 yds, i think so do a lot of folks, hence all the SBR AR's and AR "pistols" out there. but i *think* you could easily chamber an AR for this round and have something pretty neat.

    i don't have data on 6.5 or 6.8 or 300 BO so i don't know how it stacks up, and maybe i just wasted a bunch of time, but it sure looks interesting possibility to me to me!!

    i know i'm talking wildcats, but the 6.8 started as a wildcat... just sayin.

    (Speer #13)


  2. #2
    VIP Member Array WrongRecroom's Avatar
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    Heck man they just made a AR-15 in 17mag rimfire just for the folks in CA ..

    And if it works in a ar mag all the better .. Maybe see if you can get it to work or contact one of the botuiq ammo/gun companies and see

    It is a neat idea ...
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    Distinguished Member Array DingBat's Avatar
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    6.5 grendel - 120 gr spitzer @ 2431 fps = 1534 ft/lbs @ muzzle = 5.6" drop @ 200 w/ 1101 ft/lbs @ 200

    6.8 spc - 110 gr spitzer @ 2474 fps = 1406 ft/lbs @ muzzle = 5.9" drop @ 200 w/ 937 ft/lbs @ 200

    300 blackout - 125 gr @ 2003 fps = ??? i couldn't chart it as my long range tables don't go that slow for that B.C. and i can't find a good chart on google quickly.

    (all this info came from noslers website, still translating through my speer #13 book)

    EDIT- so the 7mm Rem. BR has more energy than any of these at the muzzle and at 200. it drops off a tad faster, but still stays competitive, and i bet the .50 beo has more energy, but HAS to be in double digit drop out that far, in fact i guess i should...

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    Distinguished Member Array DingBat's Avatar
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    load data on .50 beo looks scarce. one site may have it but wants me to join. no thanks.

    anyway. if you're a huge arms/ammo manufacturer and you want to take my idea and actually give me credit, let me know!! haha.

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    Member Array remington79's Avatar
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    how about this for a new caliber for ARs. MPA Introduces 300 Win Mag AR Style Rifle | The Truth About Guns
    Sent from Galt's Gulch.

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    Distinguished Member Array DingBat's Avatar
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    Quote Originally Posted by remington79 View Post
    i saw that! so with a custom barrel you could run any of the belted mags, in theory anyway. even "the big new bully on the block" .338 lapua! but even the .338 win mag is gonna have tremendous energy at 500 yards. the weatheryby mags... heck, NORMA!! that's what a lapua is based off, .358 norma... EDIT- or .375 norma?? it's been a bit...

    it's gotta be a BIG receiver though, for AR's anyway...

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    VIP Member Array nedrgr21's Avatar
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    If you go up just a bit in weight in 6.8 and 6.5 you'll reach the 1700 ft-lbs at the muzzle mark - if that's what you're aiming for. I think the AR will have issues with a sharp shoulder. If I remember correctly, the 6.5 will also have better characteristics like B.C. and sectional density and a better selection of bullets.

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    VIP Member Array Rob99VMI04's Avatar
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    Here is a answer to a question that NOBODY was asking!!!!!How about the new .416 hush puppy this just looks strange!!!

    a 450 grain bullet! Okay thais is just stupid! New brass, can't use .223 brass, 10 rounds in a 30 round magazine, 7 in a 20 round magazine!

    416 HP Hushpuppy
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    Distinguished Member Array DingBat's Avatar
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    Quote Originally Posted by nedrgr21 View Post
    If you go up just a bit in weight in 6.8 and 6.5 you'll reach the 1700 ft-lbs at the muzzle mark - if that's what you're aiming for. I think the AR will have issues with a sharp shoulder. If I remember correctly, the 6.5 will also have better characteristics like B.C. and sectional density and a better selection of bullets.
    i wasn't going for muzzle energy. i was going for energy at 200 yads with minimal drop. the heavier 6.5 & 6.8 will drop a lot more. there is no "better B.C. or S.D.- it's always a trade. small, light, fast, flat shooting bullets will always have a lower B.C. and S.D. the .50 beowulf will have far more muzzle enrgy, but will drop way off at 200. but it will have a higher B.C. and S.D. it's just the trade.

    Quote Originally Posted by Rob99VMI04 View Post
    How about the new .416 hush puppy this just looks strange!!!

    416 HP Hushpuppy
    Ha! haven't seen of thought baout that in a ong time. the hushpuppy has been around for a bit now. it too has a high B.C. and S.D., and will drop a LOT at 200.

  10. #10
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    The .416 Hushpuppy is designed to be suppressed. Since it needs to be subsonic, it doesn't need a big case.
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    VIP Member Array Aceoky's Avatar
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    Why not just go with 7/08 ????
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    Distinguished Member Array DingBat's Avatar
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    Quote Originally Posted by Aceoky View Post
    Why not just go with 7/08 ????
    will that fit in an AR mag? has somebody already done it?

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    Ex Member Array Gearhead's Avatar
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    Quote Originally Posted by Kavalander View Post
    will that fit in an AR mag? has somebody already done it?
    It would probably fit in an AR-10 mag. But 7/08 would be sweet in any platform. I've been having impure thoughts about a 7/08 for quite a while now. It is one heckuva cartridge.
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  14. #14
    VIP Member Array Aceoky's Avatar
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    It is simply a .308 necked down to 7mm so it would certainly fit into an AR10 mag , check the ballistics sometime

    I'm thinking that would be better all around and avoid the wildcat chambering as well
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  15. #15
    Ex Member Array Gearhead's Avatar
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    In fact, Remington does already chamber the 7mm-08 in their R-25 platform.
    Aceoky likes this.

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