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I finished up an 18" barreled .338 ARSM(AR short mag.) and stopped by the range for the first shots this afternoon.
I had loaded up Sierra 215gr SBT with 335, 3031 and 322 so I shot those through the chronograph and it really hit close to what Quickload had predicted. H335 was the fastest at 2484fps and NO signs of pressure.
The Sierras have a BC of .477 and were as accurate as I remember, 1 big hole at 50yards since I was just getting on paper and checking velocity.
The Barnes TSX has a BC of .437 I believe and should break 2600 easily so they should be a hog stopper like no other.
The upper was built using Olympic parts and that makes it kind of expensive compared to most uppers I can build.
I'll try some more loads this week after I get caught up on orders.
The 6.5ARSM is next and may be built on the new platform.

 

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Is this in an AR15 or AR10 lower? Then again it probably won't matter much as I have an AR10 stripped lower That I will eventually build anyways. I just have started getting parts together for my first build, I can't wait for the xtreme upper to come out for my second 6.8 and now this. I think I might have to get another couple of jobs to help pay for all this :lol:

NS, the BRD has that effect on many. LOL
These are on a AR15 lower, one rifle is a standard AR15 upper with modification and the other is a new design upper on a AR15 lower.
I was able to shoot a few after testing the 6.8s that I need to ship.
The .338 ARSM 215 Sierra hit 2554fps out of the 18" barrel, the 200gr should reach 2600fps in a 18" and 2650fps from a 20".
The 6.5 ARSM 120gr hit 2956fps from a 22" barrel with the new design upper on a AR15 lower.
I think I found a few new hunting rifles for next year.
ETA- The .338 ARSM actually beats the .338 Federal in performance and the 6.5 ARSM matches the .260 Rem in a AR15 sized platform.

 

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What kind of scope are you using for the .338 and which scopes would you recommend for long distance shots?

I have a Leupold 4.5-14x50 that I swap back and forth between rifles when I test.
Scope choice depends mainly on $, I always use mildot reticles though. I have a Nightforce that may be the best but, it is heavy and cost apx $1500,
The Leupold Mk4 6.5-20x50 is my favorite seems like it was $899?
I have a Burris Black Diamond on my varmint rifle that I also like and it was only $500 I think.
all of those are 30mm.

Nikko Sterlings are air gun scopes and IMO have a limited adjustment range even though they are being sold out of shotgun news as high power rifle scopes. They are made in Japan and 3 different companies are offering them by different names, you can recognize them by a slanted front bell and green tinted lens.

Check Natchez Shooters Supply, Optics Planet, Bear Basin outfitters and SWFA
The Falcon Scopes seem to get decent reviews also-linkhttp://www.snipercentral.com/menace4.htm

 

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I kind of doubt we will ever meet.