I had great results with the SST out of a .270, 130 gr at 3050 FPS on deer and pronghorn from 70 to 525 yards. Never needed a second shot.
With the exception of the 120/7mm, the heavier ones in each caliber are constructed tougher, the lighter ones softer.
So in other words, pick the 180 over the 150 if you want to shoot elk with your 300 WM.
How do you know which are better? I like the idea of the tougher bt but have been leery since ive heard this before. I'm not sure which are and which aren't. Do they publish that?