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Favorite powder/loads for .308 18" 1/10 auto?

Howland

Nimrod
Full Member
Minuteman
Sep 30, 2017
833
870
Upstate South Carolina
I'm hoping to draw on the experience of members who have walked the same path I'm going without repeating everyone else's mistakes. Lazy me.

I haven't reloaded for a number of years but am getting back into it now that I have access to a longer range. I used to reload extensively but primarily for bolt actions and pistols. Now I've picked up an AR-10 and want to maximize the effective distance. I'm going to go for a high BC but need it to double as an effective hunting bullet. I'm thinking of trying the 178gr ELD-X or something in that weight class as a starter because even though the range is only 400 yards, the club has monthly 600 & 1,000 yard matches. I didn't splurge on the rifle as most modern rifles are usually capable of MOA or better accuracy with proper care and feeding. I did splurge on glass and a mount/base so I can get to 1,000+. I spent double the price of the rifle on those two items.

I did pick up some PMAG M118 mags (and the empties drop freely from my PSA Gen2), so I'mlimited to the 2.83" COAL of those.

Does anyone have experience working up similar loads for a similar setup? Should I start with the faster powders on the spectrum or slower? Repeatable accuracy is more important than another 100 fps MV. I'm strongly leaning towards the Hodgdon Extreme lineup due to their development as relatively temperature insensitive. I've rarely found accuracy nodes at the upper end of the pressure spectrum but autoloaders are a whole different animal for me, this might be different.

I've already picked up some BR-2 primers, chosen to avoid the slam firing of the free floating firing pin. I also picked up a die set from the shelf of the LGS that I picked for the TC designation thinking less lube and likelihood of stuck cases. I loved using no lube with titanium carbide pistol dies. What I didn't notice until afterwards was the SB designation. Will the small base dies overwork the brass in your experience or should I stick with them to ensure proper cycling and compatibility with other rifles?

Any observations from your experiences will be greatly appreciated.
 
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168grn pills match or ballistic tips with about 41 to 43.5 grns of varget powder

I am open to the 168gr class but the ELD-X isn't made in a 168 (yet?). They do make the AMAX in a 168 and I've heard good things about terminal performance.

Varget is already on my short list, but some folks have observed wide lot-to-lot disparities in pressure, MV and accuracy nodes. Is your experience similar or different?
 
My rifle in this class: CA10-DMR .308 20". No changes apart from a flat spring to smooth it a little. Is still a bit overgassed but I can live with that.
My recipe is 43 gr N140 Vihtavuori ( being in Europe...) under Nosler 150gr. green tip #30150, federal brass and primer, 0.004" shoulder bump. 2550 ft/sec one ragged hole at 110y and very solid 1 moa under 700y. Is a mild load but works very well for me, and is not too harsh on brass...COAL 2.775 to keep Magpul mags happy
 
155gr Nosler CC, loaded to mag length. 45.0 Varget with LC brass and Cci primers. Up powder by .3-.4 for commercial brass with the same results.This has been very accurate in several autos and a bolt gun. I use the SB dies for auto guns.
 
4064/178 HPBT works great in my 18 incher 1/10. Ive shot it to 1k several times...