Re: Ahhhh, the differance a little neck tension makes.
That is a very good observation you have there. It is a 300 RUM. The reason for the low RL-25 numbers is due to high pressures generated from the lack of case expansion because of the BR tight neck chamber in this rifle. With a 180 ACCUBOND, 90 grains yields a tad over 3300 FPS from a 27.25" tube. If I were to use normal data, I would have a bomb! This is the reason that I use H50BMG mostly. It is quite a bit slower than RL-25. I still dont get top velocities with it but I at least I can get a full case and I get 'good enough for me' velocities. 3200-3250 with the 178-180's with 100.0 grains and about 3125 with the 200 grain ACCUBOND at 96 grains. I really dont sacrifice much velocity using 50BMG and I eliminate one more variable by having a full case.
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.