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Ammo options for 1:7 twist AR15

Discussion in 'Rifle Discussion' started by childishthing, Dec 22, 2012.

  1. childishthing

    childishthing Salem, OR Member

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    The rounds I used for my service rifle were 62gr, M855 to be specific. I've got plenty of that on hand, but I'm curious what experiences shooters have had with other rounds for their 1:7 barreled AR's. I'd like to also practice shooting with a different round that is as common as the M855.
     
  2. Whitey375

    Whitey375 Eugene, Oregon Active Member

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    Currently working on a handload to copy Hornady's 75gr TAP/Match ammo, at far less than a buck a shot. But also going to try and find some 77gr Sierra MK's to duplicate the Mk262 Mod 01 ammo as well.

    Sent from my HTC Sensation 4G using Tapatalk 2
     
  3. HappyRoman

    HappyRoman Sherwood Forest Bronze Supporter Bronze Supporter

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    62gr and heaver works, the 55 will shoot, but grouping not at 100yrds...1"
     
  4. Tim K

    Tim K Colorado Member

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    Black Hills has the 77g SMKs. If you load, just go it yourself. 24.5g of Varget is just the ticket.

    That load delivers 3/8" or better at 100 yards out of my White Oak 1/7 barrel.
     
  5. Spitpatch

    Spitpatch Forest Grove, Oregon Well-Known Member

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    My brother has a Colt with a 1/7 twist. Thought he was relegated to the heavier bullets. I loaded some 55g Ballistic Tips for him, and they shoot superbly. (This bullet is very long for its weight): sort of a "cheat".
     
  6. the4thshake

    the4thshake Portland Active Member

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    All of my 7 twist barrels shoot 55 grain bullets just fine. They do well with the heavy bullets as well.

    24.5 varget, R15 or tac behind a 75/77 seems to be the ticket.
     
  7. Onajoyride

    Onajoyride Tigard Member

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    Iv shot about 10k 55gr fmj thru my 1:7 with no problems.
     
  8. HappyRoman

    HappyRoman Sherwood Forest Bronze Supporter Bronze Supporter

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    congrats.
     
  9. Onajoyride

    Onajoyride Tigard Member

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    No need for sarcasm Roman, I was simply trying to inform the op.
     
  10. ron

    ron Vancouver, Washington Silver Supporter Silver Supporter

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    I have achieved sub 1/2 inch 5 shot groups out of several different 1/8 and 1/7 twist barrels using 52 SMK. In several rifles I had the best groups at 100 yards
    with 52 SMK. I use the 52 SMK for short course competition of 200 yards or less. 69 SMK or 77 SMK I use at 300 yards. 80 SMKs for 600 yards.
    My pet load for 52 SMK is using Winchester brass 26 grains of WW 748 or 25 grains of H 335. The 52 SMK is less ware on the barrel throat than the 69s , 77s , or 80s.
    I measure the barrel throat with a Stoney Point gauge to seat the 80 SMKs on the lands.