I have been shooting BT's in various 7 mm Rem Mags and WSM's since 2004. I killed 13 deer with 140 gr and 11 with 150 gr. Muzzle velocities ranged from 3170-3300 fps with both bullets. Of course impact velocities varied as well as shot angles etc. Either bullet will kill a deer, in my limited experince I witnessed quicker kills with the 140's with no regard to muzzle velocity. I recently sectioned a 140 grain in the new box and it did not have a tapered jacket. The past couple of years I have been using 150's this year I'm going back to 140's for good...maybe.
