Loading for the AR-15 - Page 3

Loading for the AR-15

This is a discussion on Loading for the AR-15 within the Reloading forums, part of the Sniping Related category; Fluffy, what is your load for 600 yds?...

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Thread: Loading for the AR-15

  1. #21
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    Fluffy, what is your load for 600 yds?

  2. #22
    Senior Member FluffyTheCat's Avatar
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    For 600 yards, you should probably get some other caliber. I tend to think of the .223 as a short range bullet hose.

    I would probably use 21.5 grains of Benchmark with the 69 grain Sierra MK. But whatever you do, work up your loads carefully.

    I know a lot of guys use H335 and other powders slower than Benchmark, but I still say that you need to use quicker powders such as IMR-3031 and Benchmark in order not to stress the AR-15s gas system.

    In a bolt action rifle, I would probably use IMR-4320.

    Fluffy
    I'm a genius. And you are not.

  3. #23
    Senior Member billt's Avatar
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    Quote Originally Posted by FluffyTheCat
    For 600 yards, you should probably get some other caliber. I tend to think of the .223 as a short range bullet hose. Fluffy
    I tend to agree. Not enough bullet mass for long range shooting. Bill T.
    Gun Control Is Like Trying To Reduce Drunk Driving, By Making It Tougher For Sober People To Own Cars

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  5. #24
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    With all due respect guys, you are not giving any consideration to Sierra's 77gr mk. It does quite well at 600yds and even further.

  6. #25

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    It's hard to concieve every possible bullet weight ,manufacturer, or bullet type. The 77 grain is useable in an AR , but needs to be seated deeper. Some bullets have an ogive that doesn't allow these bullets to feed through an AR's magazine without seating too deep. What works for a bolt rifle doesn't always work in an AR15. Load some up,ladder test your loads, and post your experience. Then everyone will know how the work.

    Jeff

  7. #26
    Senior Member billt's Avatar
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    The problem with the 77 Grain Sierra Matchking is what percentage of .223 rifles out there can shoot it? Perhaps 10% or less have a 1 in 7" twist which is required to stabilize that long of a bullet in a .223 bore diameter. Most AR-15's are 1 in 9", and many bolt guns are 1 in 10", and even some have a 1 in 12" twist. I've read that a 1 in 9" will stabilize a 75 Grain .223, but that's pushing it. 300 to 400 yards is about the limit for the .223 under most conditions. In heavy wind, forget it.

    If you look at the Wimbledon 1,000 yard matches, most of the winners shoot either 6.5-.284, or else one of the .30 caliber Magnums. I believe the .300 Win. Mag. holds more Wimbledon records than any other factory caliber other than perhaps the .30-06. But I think it's even surpassed that. Heavy bullets with high B.C.'s, along with high velocity equals success at 1,000 yards. The .223 is pushing the envelope in all of those departments. Bill T.
    Gun Control Is Like Trying To Reduce Drunk Driving, By Making It Tougher For Sober People To Own Cars

  8. #27
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    Hey I am not trying to ruffle anybody's fur. I just think there are a lot more options to loading for the AR-15 than 3031 and 55gr bullets. The information already posted here is at least in my experience right on the money. The 1x7,1x8 twist barrel has been a standard for service rifles for some time now and someone may correct me but I believe Sierra developed the 77gr mk for loading at magazine length. I have used it for competition in the National Trophy Infantry Team match at Camp Perry. We did quite well with it.

  9. #28

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    I don't think you're rattling anyone's cage. We just gave answers to the best of our knowledge. I suggested that you try some 77 grain bullets out and see how they work for you. 69 grain Sierras work the best for me. Useable effective range of a .223 usually is around 500 yards,paper punching a bit further. No one here is against experimenting. If they work in your rifle, post the results. Perhaps you have some knowledge we aren't privy to. Sniper Central is all about sharing info and experiences to better us all.

    That said, Madgunsmith's original posts/stickies for reloading are for the novice.The loads represented are basic beginner loads.That you don't see a lot of different loads represented is because folks don't want to overwhelm the folks new to loading for the AR15 with a lot of nonbasic extra info .

    Jeff

  10. #29
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    Yes, I understand that this is about providing information for the beginner and I think it does a great service to them. I am very fond of the AR-15, so I just get a little prickly when someone refers to it as a short range bullet hose.
    I was trying to recall what the load was we used for NTIT and I am a little embarassed to say I can't. The team captain did all the loading so everybody had the same ammo. I remember it was 77gr mk,rem 7.5,win brass but can't recall the powder. The bullets were seated to 2.250" for the mags and I heard him say at one point the muzzle velocity was just under 2700' per sec. It seemed a very mild load at least out of my rifle which is a stock Colt Sporter Match HBar. At 300yds I was easily able to hold the Xring of a SR-3 which is @ 3".

  11. #30

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    Just a guess, but it sounds like an IMR4895 or BL-C(2) load. H335, Varget,RL15,N530,N550,and Winchester 760 should all be able to duplicate the velocity. The best way to know for sure is to ask the original loader, unless it's some sort of competition secret.

    A place to check out some extreme long range load ideas is www.reloadersnest.com . Be forwarned that a lot of these folks are pushing the envelope on safety for the sake of velocity at long range.

    That said, the AR15 is designed for modern combat with moderate ranges. Why shoot 1000 yards when a helicopter or APC can drop you off within 100 yards? It's asking a lot of the little .223/5.56x45 to go past 500 yards. Possible, sure. But practical? Competition is the place where that need exists. I don't think Mad was trying to insult , he just didn't see practical application. There are cartridges far better equipped to compete at 1000 yards. A .22lr can concievably travel over a mile, but it's practical use is 50-100 yards.

    Jeff

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