I'm planning to reload for my M1 Carbine using a 100g lead boolit with 2400 powder.
The Lee book gives a starting load of 10.2 grains and a never exceed load of 10.3 grains.
Lyman starts with 11.0 grains and never exceed of 12.5 (compressed).
Both manuals developed their loads with about a 110g lead boolit.
The wide difference seems odd to me.
I don't understand the difference in Lee vs. Lyman loads but am pretty new with smokeless. I have been reloading BP cartridges for a while and have started with .45 ACP with good luck.