Re: How far with 180 grains and a 300 rum?
Conservatively, at elk altitude the 180 AB starting at 3200 FPS still has over 1800 FPS and over 1300 pounds at 1K. This is at a reduced BC and the lower elevation limit for elk of 6000'. Some elk will be found lower but not many. This is of course with the western states in mind. Elk are tough but with a high shoulder shot theyre not going anywhere. IMHO, the 200 AB is only marginally better. I had the same issue with both of my 300 RUM's. They loved the 180 AB's and only tollerated the 200 AB's. One with a 12x barrel and one with a 11.25x barrel. Both would shoot the 200 AB's at .5 MOA where both shot the 180's at .25 MOA.
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.