Be careful with the Lee data, if it's 8x51R Lebel.
There are many reports of the Lee data sticking bullets in the bores of Berthier carbines and rifles. Some of the data is so conservative that it goes too far and becomes dangerous.
Crankylove and I spent several months trying to find something other than Lee data for the cartridge, almost 10 years ago, while he was trying to put together some usable loads for an extended family member's rifle. (Which we were unable to borrow for testing.) We didn't have much luck, and eventually had to just use our best judgement when comparing "pet loads" with the Lee data.
Of course, if it's the revolver cartridge, that's a whole different beast. I have no knowledge or experience with that one.