Ease. You can follow the die instructions (touching the shell holder + a quarter turn or whatever) and all you need to do to get that minimal shoulder bump is select the appropriate shell holder. If you have two or more rifles of the same chambering and different length chambers, you don't need to fuck around with the die each time, you just swap shell holders. Transferability into other presses too - you could take your die and shell holder to the range and use the equipment in the reloading room there without needing to piss about setting the die up again.
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