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Roger. There are others too, I have some sierra data for 308 in a sierra pdf, they're using 22".
One other loading guide uses a 26" but...

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Let's stop and take some notes here. You are in a multi-dimenional "teachable moment." Synthesizing from other posts. And I say this b/c...

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In the industry partners section of this forum... AR15 buildbox.com, owned/run by lrrpf52

Ordering Grendel Handbooks

05-06-2023,...

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The other thing about xbr, as with all powders, is they do vary from lot to lot.
I had one lot I could go to 28.3 with 123's/120's, but then my...

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The do-all butt stock is (carbine) Luth-AR MBA3, or magpul has a "PRS-lite" (carbine) that works also.
Which ever one is at the best...

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About the "format"... are you talking about adequate cheek weld, or about pistol grip angle? If so, there are parts that remedy that... I have...

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Also... get and keep some spare parts in your tool drawer. Like joebob or other sellers, they have "AR15 spare parts" or "AR15 essential...

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Not an outcast at all, welcome.
Lots of bolt guys and AR guys, some have both, do you have a rig yet?

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The ruger, whether gen 1 or gen 2, has problems feeding a short cartridge like the grendel or 6Arc out of the AR mag... now some folks will say theirs...

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Re-size first, to a shoulder setback that you've decided on (see all of the above for options) - like I said I go for 0.005-0.006 shoulder delta from...

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I would go along with most of the comments here... but here's what I'd add, fwiw.
When you re-size don't go for the absolute minimum shoulder setback....