data
Msta999: The Lyman reloading manual (among others, see below) has rifle data for the 45 Colt. There is data for both 250 grain and 255 grain lead bullets.
There is no data for HP38. That powder is described as "duplicating the performance of W231" and 231 is listed - useful, perhaps, as a point of reference.
The Lee Modern Reloading Manual, btw, lists 7.3 grains of HP-38 as max for a 230 grain lead bullet. That is a substantial difference from your data. You may want to check a bit more.
There is rifle data for lead bullets, also, both in Speer and Hornady.
Most data available is for the heavier bullets. That fact may be worth considering as you work up your loads.
Pete