Interesting. I'm doing a 6.5 SAUM build on a Savage 110 SA small shank receiver with a standard .308Win bolt head. I was told by one person that I would need to replace the firing pin assembly and baffle in conjunction with going to the WSM bolt head, as those parts were different in the WSM models bolt. Looking for clarification/confirmation I later called PTG and spoke with Dave Kiff about this, as I'm using their magnum bolt face when the next batch ships. Dave wasn't aware of any different baffle sizes and only the different SA and LA firing pins. I haven't 100% resolved this quandary as I don't have the WSM bolt head in had to compare to the .308Win bolt head. Helidriver if you'd be gracious enough to snap a pic and do a quick thickness measurement of the bolt head I'd appreciate it.
I should probably give SSS a call in the near future as well.