I'm using the Lee seating die, and that is putting a all crimp. I don't need a crimp on these, so if I understand you correctly I back the die off a bit so that it does not hit the brass. Then I can still adjust seating depth using the spindle. This will give me no crimp, and will not apply any extra pressure to the shoulder. Then, any cartridges I want crimped, I simply use the Lee factory crimp die