Re: Starting loads for 300 ultra and retumbo
I have a .333 ND and a super tight chamber and 90.0 is MAXIMUM for the 180 accubond and 86.0 for the 200 accubond is max. Both RL-25 and RETUMBO give me the same velocities, but retumbo seems beat up my brass much more. If retumbo isnt quite the ticket try RL-25. Me and several buddies have had AWESOME results with it. The 1 load that my rifle excells with using retumbo is 95 grains with the 155 AMAX @ 3600 FPS. It will group .75" at 300 yards. I find the 178 AMAX does much better as it seems to fly MUCH flatter due to the high BC despite the fact I can only get 3300 FPS with it. I get 33" of drop at 600 yards with the 178 and 35" with the 155.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.