While I do not have your long range experience, you might consider leaving it the plain ole 30-06. With the slower powders and longer barrel, it might surprise you. I read an article a few years ago by a well known writer, Sam Fadala, that put a long barrel on his '06 and was getting 3000fps with 180gr bullets from it. He used it (with special permission) to take a cape buffalo. That 3000 is dead in the middle of 300 Wm speeds.
He did all of this because of a shoulder injury also. My guess is with a similar load, you'd still be able to get about 2700-2800 with a 210gr.
Bookmarks