***What everyone posted about NOT using a filler with smokeless powder----Not a harmonious outcome resulting***!!!!
J. Jones--have you every used Hodgdon Titegroup? I have used Win 231 alot for 45 Colt, HP38 is the same powder, just in different containers. Always had good results with 231, even tried some HP38, didn't notice any difference. Started using Titegroup some time back for 45 Colt (also 9mm/38 Spec/45 acp) as one of the major attributes is that it isn't position sensitive in the brass case for combustion, especially in big ol brass like a 45 Colt where the powder charge doesn't fill up the available space. Although I've never used a chronograph on any of my handloads, I've had excellent results with Titegroup. All of the published info with TG indicate pressure and fps are better and more even, also the 'not position sensitive' is my biggest vote for it. Availability may differ in your area, but if available or when so, TG is a good powder for the 45 Colt.