Lloyd - Dave is actually line-boring a SBH stainless 44 mag cylinder to 45 Colt for my Hunter. I talked to him the other day and told him about my concern. He said he has seen some Blackhawk receivers with crooked threads (not just Hunter receivers which are threaded differently than regular Blackhawks). However, he said he can usually compensate for the crookedness. I am more or less just wondering if anyone on this site has ever had custom cylinder work done on a Hunter model by any of the big name smiths and if so, were crooked receiver threads an issue.