We have been using the 120 B-Tips for years in .280 and 7-08. Velocities are 3198 and 3086fps. We have had no blowups on numerous mule deer, antelope, and 1 six pt. bull. The 120 was made with a thicker jacket for the silhouette shooters, if I recall correctly. They needed it to hold together to knock the rams down.
I have seen 30 cal B-Tips make a bloody mess, however, but have no fear of the 7mm 120's.
http://i31.photobucket.com/albums/c369/12970/Hunting%20and%20Shooting/120grBT.jpg
