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My 8-twist SSK Contender barrel did a pretty good job with the 220 SMK's. I never tried the 240 SMk's in it. It just seems to me that you can't over-stabilize a subsonic projectile, so I went with the 6.5 twist. Also decided not to deal with JD again, so I gave PacNor a shot (they've done an excellent job on other rifles for me) at the whisper. I am certaily pleased with the outcome. By the way, this 6.5 twist barrel also shoots 125 grain Sierra ProHunters (at ~2000 fps) into itty-bitty little groups.
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