I noticed the COL listed here for the 454 Casull is shorter than the COL listed in Lee, Hodgson, Lyman, and other load data sets. I'm just starting my journey into reloading so I'm a complete novice so wanted to know why it says max cartridge length of 1.68" and a COL of 1.765" on the schematic of the cartridge? I almost loaded some Hornady XTP Mags using the 1.665" number labeled as cartridge length. I doubled checked the number and saw that all my other load data manuals were listing the cartridge length as 1.765" and so loaded them at that number instead. Am I missing something and the cartridge length stands for something other than COL? Thanks for the info.
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I would recommend using the OAL Trim dimension listed on the manufactures load data. Hornady uses 1.373"/1.383" as your min/max trim rates. The 240/300gr XTP have a COAL of 1.745". If at any time you are unsure of your COAL, start at the max of 1.765" and check chamber fit and function. To tight. Lower .010" (1.755") and check, Repeat if necessary. Try to use the recommended manufactures COAL for any bullet, ie, Barnes, Sierra, Speer, etc.