I have the 5 ½" Blackhawk (Plowhandle) and my acp is slightly more accurate than my colt. After about 100rds factory at start, all my loads are reloads - 200 SWC acp and 230gr LRN for colt. Both are really good shooters,
also have the Vaquero Birdshead in 45acp - the gun is way more accurate than me. Hard for me to accurately shoot that 3 ¾" Bbl. I have shot 230gr FMJ, Plated and RNL plus 200gr SWC. The SWC appear to be the best for that gun.