I have always let the length of my revolver cyl determine the OL of my 45 Colt hand loads. I recently got a new Taurus Thunderbolt and discovered that 1.600 is it 1.590 is better. My starline brass is generally around 1.275 and I would trim to 1.270 in order to start with all the same length. Here's the problem If I take the 1.590 OL and subtract the canalure to meplate length of .380 (335 gr HCL) I would be trimming to 1.210. The other option would be to ignore the canalure and crimp on the ogive. I like to use the canalure and a factory crimp for use in the tube mag. Suggestions?