I won't get into choices you have already made, it is your build, but I will say that they would't all be my choices although I do only us Redding dies.. I recommend only ATLAS bi-pods for field use. On my mid range (out to 900yds) We have 8 of the 10 shooters using 6.5Cr's. Another 260rem. and 1 using 6Cr. On long range (out to 1 mile) we use magnums although with hand loads and Berger 140 bullets a good shooter can print descent groups at 1 mile. I STRONGLY you consider BERGER bullets if you can find them. Also the very low drag high BC bullets have a Secant ogive and can be VERY sensitive to OAL (jump to land) setting. The Berger hybrids are a nice balance of tangent and secant ogives and are not sensitive to OAL like the pure tangent bullets.
We do a LOT of long range precision shooting at my place both military and civilian.