If I was to buy a 454 Casull SRH and the cylinder throats were .455 I would be a happy camper . As cast bullets are supposed to be 1-2 thousandths larger than the groove diameter of the barrel . i wouldn't want the cylinder throats " down sizing " my cast bullets . Yes sir , cylinder throats sized .455 is perfect .
Barrel leading is usually caused by a problem within the barrel itself , if the cylinder throats are larger than the groove diameter of the barrel . Many times a tight spot , a " choke " where the barrel threads onto the frame is the culprit , or machine marks inside the barrel , a tight spot where they " roll stamped " the markings on the side of the barrel .
You don't have to take my word for any of this . Simply spend about $15 and buy Veral Smith's book , " Jacketed Performance with Cast Bullets " . His website is " LBT Molds " . He is a master mold maker and is considered " THE " authority on shooting cast from pistols , semi auto's and rifles . I hope this helps . Regards , Paul
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