I haven't shot BB's or underwoods 125gr .357 load over my chronograph, but I have shot a bunch of their .380, .40, .45 and 9mm. I have found that BB's numbers to be spot on in all of my pistols. Underwood's numbers were within 25-30fps IIRC. I carry Underwoods +P 230gr gold dot loading in my SIG P220 and BB's 100gr +P hard cast .380 in my Beretta 84B.
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