I love most all 6mm rounds, and I think the Creedmoor might be the best balanced out there now, and especially for your non-lead bullets. I'll be interested in how those 95 lrx group for you, I think that will be a great bullet in that caliber.
I'm a big 243 fan but most aren't twisted fast enough for that bullet.
I'd personally check the distance to the lands for each of the bullets you want to use and go from there. It's pretty likely the short varmint bullets won't reach the lands with any useable amount left in the case, but it's nice to know exactly where you're at.
There's multiple ways of finding that measurement as I'm sure you know. FWIW, about the only time I use the measurement given in the book is when I'm loading something for someone else and I don't have access to their rifle. I figure that measurement should chamber and function in any firearm hopefully.