JD, I have a 25 wssm S die that I use for a 6.5 wssm, just dropped in a .296 bushing and it works like a charm. Give Redding a call, I'm sure the can help you out.
I got on redding about this the last time I spoke to them.
I use an expander on new brass to take the dings out of the necks the first time, then I remove the expander and size the necks down with just the bushing and trim/debur.
JD Been away from the computer for a couple of days. Change the bushing and expander and your set. I use 7mm RUM bushing dies to load for 6.5 RUM. That was all I did and it works fine and cheaper than the $185 Redding wanted for the custom dies.