I have a 45LC and never thought of subsonic loads. Are you using loading tables? Which ones?
almost any powder manufacturer will have a “cowboy” section in their data these days. In addition, original loadings for the 45 colt were typically subsonic. The standard loading these days seems to be around 850 FPS or so.
yes, I use tables for all my reloading.
The best by far are on line at www.hodgdon.com. They not only have the fps, but the pressures and are easy to download and use. They are the absolute best.
For some real fun with your .45 long colt look here:
Bullet pouring porno for .45 LC on pages 10 and 11
http://www.neihandtools.com/catalog.html
Making your own wax bullets for .45 LC:
http://www.americanrifleman.org/ArticlePage.aspx?id=2294&cid=32
Special drilled out cartridges to use 209 primers for 950 fps wax bullets:
http://www.banditshooting.com/
.45 LC is the most fun you can have with a gun.