With the 105's, RL 22 gives the best speed and accuracy. H1000 is 100 fps slower with equal accuracy. 50 grains of either works for me. I lean toward H1000 as is is temp stable, I get some pretty big velosity swings with RL-22 from summer to winter
I have 2 Nightforce 3.5x15 x50mm scopes and they work great, even shooting out to 1K. I went with the 50mm objective as I find the 56 just a little to big on a hunting rifle. I'm sure this would compliment your setup just fine. I went with the NP1-RR reticle on both.
I had my forster 243 die honed to .269 and have had no troubles. My loaded round measures .272". This is a hunting rig and seems to have good neck tension.