Hi Randy,
It's more than just case length that is an issue.
Straightwall cases aren't actually straight, they taper.
But, if your 45 Colt dies are carbide they will try to make your cases straight!
The problem is the carbide ring will either be too oversized to give adequate case neck tension on the bullet, or the carbide ring will be too undersized and will leave the case wall ahead of the web and head area unsupported by your cylinder chambers.
Given the high pressure of the Casull cartridge, either situation is not ideal.
If I am not mistaken, the Freedom Arms branded dies that came out in the 1980s were regular steel so that the sizer could be cut with the correct case taper along its full length.
If your dies are steel, you might be in luck. For years 45 Colt dies have been all over the map dimension-wise.
Assuming your revolver has correct tight chambers, a resized case should be as snug a fit as possible without any force needed. Then, make sure your expander plug is a correct match to your chosen bullet diameter.
Jim
