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Author Topic: Heaviest bullet for mag length 5.56 Nato  (Read 2496 times)

Offline TiGuy

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Heaviest bullet for mag length 5.56 Nato
« on: 11:23 PM, 11/18/10 »
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  • I have an 8 twist AR and need advice on the heaviest bullet I can load to 2.260 COAL. Seems like some 77 grain rounds might work. I am looking for a long range target round (600 yd) and I only use ball powder such as 748 or H335 so I can drop charge. Any guidance?


    Offline swehrman

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #1 on: 11:41 PM, 11/18/10 »
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  • 77 grain is the heaviest that I know of.  I've seen some loading data for 77's using WW748, but most people use RL15, Varget, N140.  If I remember correctly 748 has a reputation for being temperature sensitive and so loads worked up in cooler weather will get squirrely when it gets warm.

    -- Scott

    Offline GerryM

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #2 on: 05:39 AM, 11/19/10 »
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  •  Reloader 15 is kind of coarse to drop from a measure.
        I think you will have better luck with the VV`140 and varget,
          They should drop from a measure fairly easy. 


    Offline 280man

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #3 on: 08:34 AM, 11/19/10 »
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  • Most service rifle shooters that I know don't worry about mag length for the 600 yard line because its slow fire single load. If you have to have them fit in a mag I would stick with 69gr match or 75gr AMAX
    « Last Edit: 08:41 AM, 11/19/10 by 280man »
    Rick Jensen
    2017 US F-Class Open Team Captain
    Claremore, Oklahoma

    Offline kentuckytroutbum

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #4 on: 10:14 AM, 11/19/10 »
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  • My favorite load for the 600 yd HP line is a Hornady 75 gr. Amax on top of Accurate A 2520, seated 0.020" off the lands. 2520 doesn't seem to be temp sensitive, as I've shot this load on a 95 deg. sunny & humid day without any pressure signs. The load is longer than the magazine, so it is single loaded.

    Bill

    Offline people

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #5 on: 10:39 AM, 11/19/10 »
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  • I have shot plenty of 77gr SMK from my AR-15 in SR competition.  I stopped shooting different loads at different ranges.  I have been just shooting the 75gr HPBT or the 77gr SMK loaded to fit in the mag.  I also read http://www.usrifleteams.com/ here.  Just go to the national match section.  Many shooters are using just one load.  Apparently it is going back to the  ideas of the M1a of using just one load.  Instead of one for offhand at 200 then one for 200 rapid then 300 yd rapid and one for 600yd slow fire.  I know it can be tough to remember to bring 4 different loads for one 88rd match.  Then to bring extra in case of a shoot off or reshoot.  I was bringing about 400rds to a match.  Until I grabbed the wrong boxes one day.  Instead of bringing the loaded ammo I bought the boxes with what was left after four shoots.  Yes imagine my surprise when I am setting up for offhand and seeing only 12 rds in my ammo box.  I was very lucky that I had a few extra fully loaded 30 rd mags in my car.  I shot two 88rd matches that day with hand loaded with 55gr FMJ.  I did not do to bad either.  Granted I did not do that great either.  On a plus I was not last and I know for a fact I was the only one using ball ammo that day.  Lol  good times. 

    I have used many different powders to see if I can get these to shoot any better.  Many different powders work but I do not remember right off the top of my head what ones I have tried.
    They say “I am pro hunter.”  Means they do not care about your handguns or your AR-15.
    They say “I am progun but why do you have to have a 15 or 30 rd mag.” They are antigun.
    Are you progun or antigun?


    Offline Klong

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #6 on: 10:21 PM, 11/30/10 »
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  • Do not like the 75 AMAX for mag length ammo. The 75 AMAX ogive puts the bullet so far into the case neck that the neck is not gripping the bullet. You can use the Hornady 75 HPBT though. The 73 Berger works best for me with V540 powder. The standard load for many is 24.7 varget and the 77 SMK. Start 10 % lower and work up.

    Offline cmillard

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #7 on: 09:16 AM, 12/01/10 »
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  • klong, 24.7 seems a little high for the 77.  i loaded some 77 sierras a few years back in my NATO chambered M4 that I built and 24.5 grains of varget smoked the primers.  it also stretched the primer pockets too much to where the brass was not loadable again.  i knocked the charge back a bit--24.0 i think and that worked much better
    Cole Millard 1155

    Offline Klong

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #8 on: 08:56 PM, 12/01/10 »
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  • cmillard, that is why I said start low and work up. My chambers are Wylde design and may account for the ability to shoot hotter loads. I only get about 6 loading before primers start to loosen up.

    Every rifle is a little different, but I know dozens of competitive shooters that shoot this load and I have shot it in at least 4 of my rifles.                                               

    Offline cmillard

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #9 on: 11:19 PM, 12/01/10 »
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  • Klong, are you running a carrier weight with that load?  i shot a carrier weight (tungsten insert) along with an enidine hydro buffer in the stock and it still smoked the primers.  that was with 2 different barrels.  i was suprised to see that it still did it even in the NATO chamber.  but, i think it could have been because of the CCI BR-4 primers--they tend to be hot.  i have not tried my go to primers (wolf srm) with that load though.
    Cole Millard 1155

    Offline Klong

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #10 on: 07:25 PM, 12/02/10 »
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  • No carrier weights and I shot BR4's and 450 primers without problems. The load I listed is a common load used for highpower rifle competition and the standard load used by many competitors at the National Matches (DCM) for Infantry Man's team matches (AKA Rattle battle).


    Offline cmillard

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #11 on: 11:32 PM, 12/02/10 »
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  • it must have been my barrels then.  i was using sorted Lake City brass--the cases with the biggest internal volume--and the primers still blanked.  once again, all barrels are different--as are powder lots and primer lots!!
    Cole Millard 1155

    Offline 762willdo

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #12 on: 02:18 PM, 12/09/10 »
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  • You can go with the 77SMK if you want its a good bullet but if you look at the numbers on the berger 70 you will be suprised, its all i shoot now.

    Offline 15Tango

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    Heaviest bullet for mag length 5.56 Nato
    « Reply #13 on: 10:32 AM, 12/10/10 »
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  • In regard to mag loaded length I've never really noticed the Berger 70 grain before - 371 BC isn't bad at all. Seems like the 69 SMK gets a lot of attention but the BC is only .301. I made the switch from 69 SMKs to Hornady 68 HPBT match last year which has a BC of .355 and they're only $14.73 per 100 from Powder Valley. The Berger looks good with a bit better BC but they cost nearly double.

    I'm bringing some 68 Hornady BTHPs down to Texas (along with a lot of other rifles) at the end of the month for hog hunting, if I end up shooting anything with them I'll take some pictures and give a little report.

    If you're going for all out weight for lethality in hunting it might be hard to beat the 77 SMK though. I've heard nothing but good about their use over in Afghanistan.

    Wayne
    Selling gun gear off to buy camera equipment.


     

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