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This may not help much for sub-sonic suppressed loads but over the last couple weeks I experimented with the same 300 whisper load in two different rifles…..223 brass formed in Hornady dies 18gr of H110 and a Speer 125 TNT…the first rifle is a SSK AR 16” 1:8 barrel, the round goes through the chrony at 2050fps……the other rifle is a CZ 527 with a 24” 1:11 PacNor barrel, the same round goes through the chrony at 2340fps…don’t know if this helps but I was surprised to see 300fps difference…..Kurtz
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