I just bought lee dies(3) for 400 corbon and have started practicing making 400 corbon brass out of new 45 acp starline brass. I dont plan to load any until my barrel arrives because Corbon doesnt give OAL on the data I've found and the landing/ or shoulders are different among brands of barrels. I've found a few starting loads to work from, but these are with 400 corbon brass with small pistol primers. I guess its allright to take it that standard LP primers from the formed 45 brass will not over pressure these starting loads. These will be worked up for target loads. For higher velocity rounds I'll use 45super brass.