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M118LR experience in a standard AR10

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11 years 11 months ago #13370 by Siscowet
M118LR experience in a standard AR10 was created by Siscowet
I am interested in hearing any and all experience with the M118LR round in AR10's. With a 1 in 11 barrel twist, is it pushing the envelope too much to use a 175 grain? I am using the standard heavy barrel, not the AR10 T.

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11 years 11 months ago #13372 by LebbenB
Replied by LebbenB on topic M118LR experience in a standard AR10
I have an AR10A4 carbine with an 11.25 twist. I've shot 175 gr M118LR and FGMM out of it with no issues in regards to accuracy. I have a FF forend on mine and my groups stay about 1-1.25 MOA out to 600m or so. With that twist, 175 would be the max I'd go as far as bullet weight is concerned.

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11 years 11 months ago #13373 by Siscowet
Replied by Siscowet on topic M118LR experience in a standard AR10
Thanks for the feedback. That is outstanding out of a carbine length barrel! The weather here in Wisconsin is supposed to break this weekend so I hope to get out and put some rounds through mine. I am guessing that it will be more accurate than my old eyes let me be.

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11 years 11 months ago #13376 by LebbenB
Replied by LebbenB on topic M118LR experience in a standard AR10

Siscowet wrote: Thanks for the feedback. That is outstanding out of a carbine length barrel! The weather here in Wisconsin is supposed to break this weekend so I hope to get out and put some rounds through mine. I am guessing that it will be more accurate than my old eyes let me be.

600-700 is about the norm for a 16" 308. I've seen videos of folks going out to 1000 with them, but I've never done it or seen it done myself. A 16 inch barrel doesn't give much away in terms of MV compared to a 20 inch, and the barrel doesn't flex as much as a 20 inch either.

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11 years 11 months ago #13380 by Siscowet
Replied by Siscowet on topic M118LR experience in a standard AR10
I have a lot to learn about that. My AR15 National Match HBAR from the old days is 20 ". So that's what I am used to. That more than anything is why I picked this length, that and finding anything right now without a 8 month wait is tough. At least in this area. So I grabbed this one when I could.

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11 years 11 months ago #13401 by LebbenB
Replied by LebbenB on topic M118LR experience in a standard AR10
Nothing wrong with a 20" pipe. It's easily an 800m+ set up. IMO, Armalite really underrates the accuracy potential of their rifles. I suppose it makes more sense to say a rifle will do 2-2.5 MOA and have it exceed that spec than to make a bold claim of 1 (or less) MOA and not be able to reach that mark consistantly.

Hope you're able to get to the range. What sort of optics are you using?

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11 years 11 months ago #13402 by Siscowet
Replied by Siscowet on topic M118LR experience in a standard AR10
Nikon Monarch 4x16. Best I could find within my budget.

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