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Barrel length affects things greatly as well. My .458 w/ a 8" 1:14 barrel can't shoot 500gr subsonics without tumbling almost immediately, but 400gr supers it eats like (expensive) candy. That short needs a faster 1:10 twist for that heavy of a round.

Especially with even the shortest RDB being a 16" barrel and lots more with the 17" or 20" barrels you're dead to rights: The RDB as a whole is better with heavier grain weights, 65gr at a minimum on the 20" IMHO. Hell at this point I'm considering getting some Dark Horse 110gr to try on my 20" RDB since it's no longer that expensive compared to run of the mill thanks to ammo prices surging so badly.
Thanks for the info.
 

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Nothing but XM193 through mine lately, mostly American Eagle, PMC, or Lake City surplus, usually at 25 yards, but good enough to be my HD rifle. Far handier than the AR and quite accurate at those distances. It has never failed, but is usually limited to 40-60 rounds per range trip.
 
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