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what is a good subsonic 338 cartridge?

Im going to build a 338 rogue and want to barrel up something else using a 338LM bolt face to shoot subsonic. I have a 1/9.35 barrel and a 10-9 gain twist coming also... both 27”, what are your thoughts?

atombomb , my guy in Tennessee , using a 338 LM imp with a 9.3 twist Brux, says he's happy out to 600 yds using 19.5 gr Trailboss with a 300 gr Matchking.
 
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The usual suspects, subsonic cartridges Ive chambered for.....
510 whisper, 50EBG (socom case),458 socom,416 socom, 375 whisper (BR case),338 whisper,375 Covert (Grendel case)338 Covert,30 covert,7mm Covert,30 whisper,6mm whisper , 9mm
 
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