I have worked up loads with R16 for 257 Bob and 6.5x284 and have been pleased.
Can't find more powder or I would try it in the 270. But now running R17 in it mostly.

"The significant problems we face cannot be solved at the same level of thinking we were at when we created them."
Albert Einstein

At Khe Sanh a sign read "For those who fight for it, life has a flavor the protected never knew".