308 win AR platform reloading question

Discussion in 'AR15/10 Rifles' started by DUSTY NOGGIN, Dec 2, 2019 at 7:53 AM.


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  1. DUSTY NOGGIN

    DUSTY NOGGIN Well-Known Member

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    ive loaded up a couple different bullets to try to get this thing broken in 150 and 168 with imr4064 to finish off that bottle .. when looking at the data led me to notice powder options ( mostly faster than i have on hand ) and have some questions for any of you that may have already went through this

    this rifle is a 24" 1:10 & should stabilize anything that will fit in the magazine. i would like to put the heaviest bullets i can in there

    hodgdon data has "308 win" and "308 win service rifle" the service rifle only does mid weight bullets and faster-ish powders .. is that because those pressures are good for cycling ? or is it because that what hodgdon has tested to meet 7.62x51 nato pressures??
    so my questions are when using the slower powders is there issues with over/under cycling gassing pressure issues .. where an adjustable gas block would be required / useful ??

    and next question would be about bullet choice . id like to get as much distance outta this 308 win as i can. i think larger than the 168's is where id like to start... its not intended to be a hunting rifle but if i can achieve a little room in case by doing a sp .. i haven't measured throat yet so not really sure if i have any room to spare there anyways . maybe the 175 custom competition ??

    just thinking ahead .. not trying to waste a bunch of components if i don't have to

    another thing , would be progressive loading and ball powders you've have luck with .. for a separate load work up
     
    Last edited: Dec 2, 2019 at 9:15 AM
  2. mtwarych

    mtwarych Well-Known Member

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    My son and I started with 165gn Nosler Ballistic tips and CFE223 powder chasing speed and accuracy. The results of the combination were dismal.

    We then started working with H4895 with the same bullet and hit the jackpot with accuracy but the speed was a little slow, we decided that the accuracy was the most important part we wanted so we stayed with H4895 and the 165gr Nosler Ballistic Tips and haven't looked back since.

    We are planning on trying out the 165gn LRAB this coming summer, it will be interesting what we can squeeze out of them.

    As of right now, my son is shooting 42.5gn of H4895 under a 165nbt in military brass with a #41 primer to start things off.

    I am loading 40gn of H4895 under a 165nbt in military brass with the same primer.

    My sons rifle is a DPMS GI LR308 and my rifle is a DPMS GII Hunter.
     
  3. DUSTY NOGGIN

    DUSTY NOGGIN Well-Known Member

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    thanks man thats a start .. ill take any advise i can get .. have you tried anything 175 to 180 ranges ??
     
  4. mtwarych

    mtwarych Well-Known Member

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    We decided to forgo the 175 to 180gn bullets because we are using the AR's to hunt with and we got what we needed from the 165's. Also, try to stick with service rifle loads due to you and the rifle taking a beating from loads meant to be fired in bolt actions. The loads meant for bolt actions may lead to other problems like overgassing and failures to extract and eject due to the bolt opening before the chamber pressure is low enough and the bolt travelling too fast to function properly.

    One other powder I will work up in the AR's this coming year is AR-COMP. I use this powder in my 6.5 Grendel loads and it is so accurate I would like to run it in the 308's if I can find a better load than the H4895.

    As a matter of fact, now that I think back on the load work ups, my son's rifle is marked with 308Win and my rifle is marked 7.62X51, which may be the reason my son's rifle runs 2.5gns more powder than mine. His velocity is about 70fps higher than mine also.

    I see no reason why you would have any trouble loading the 175's and the 180's. All I will suggest is not loading to full 308 bolt action loads. Stick with the middle of the load ladder and you should be fine.

    My GII came from the factory very overgassed and the rifle didn't function or shoot very well. (The rifle beat the hell out of me and had troubles with bolt-overs and my brass was beat to $#!t) I installed an adjustable gas block and a 10oz heavy buffer. What I have now is a well behaved, very accurate gasser that is a pleasure to shoot. I recently installed an Omega 300 suppressor on it and believe it or not, the rifle shoots more accurately than it did before, I can't wait for pinecone hunting season to open when the snow is off the mountains, If I can see them, they're in trouble.
     
  5. rsmithsr

    rsmithsr Well-Known Member

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    the service rifle data is typically m14/garand based. those limits do not really apply to ar10s. I shoot berger 175 as a base bullet in 24" armalite 10t. 1/2 moa is normal, I have shot some smaller.168 is a 300 yard by design bullet. I shoot 185 in a bolt gun, also 1/2 moa to 600 yards.

    try to find a bullet that will get you close to the lands from 2.83(typical max mag length)
    or get a bbl based on your needs.
    as far as a progressive, you need to find a load WINDOW that is a couple of tenths wide, so the progressive can still produce match quality ammo. the alternative is to add powder individual ON THE PROGRESSIVE PRESS. YES I have loaded 600 yard match ammo on a progressive(Dillon).
     
  6. mtwarych

    mtwarych Well-Known Member

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    rsmithsr,

    what are your suggested powders? I would like a little more speed but want to keep my accuracy. I don't have a progressive, I just do my reloading one stroke at a time.
     
  7. rsmithsr

    rsmithsr Well-Known Member

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    not at home, but I know that 2520 and 4064 both worked well
     
  8. DUSTY NOGGIN

    DUSTY NOGGIN Well-Known Member

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    my lrsr pmags maxing out at 2.81 ish

    are the 308 win steel and poly mags compatible ??