Re: How would you develop a load for two rifles?
That question has nothing to do with separate dies. You can readjust seating depth on the same die for different rifles. BB
edit: besides that, there is an endless variety of different powders and bullets for two separate rifles without worrying about seating depth.
But, I have two rifles chambered in 6MM Remington. My rule to keep things simplified is to use different cases, different primers, (Remington and Fed) because you can see the color difference, and hollow points in one and spitzers in the other. I think seating depth, as a visual is hard to determine, at a glance, but hollow points and spitzers are easy.