RE: winchester ballistic silvertip
The silvertips will perform exactly like the Nosler BTs because they are the exact same bullet, just with the Lubalox coating. BTW, the coating leaves no appreciable residue in the barrel as it is basically wax.
Personally, for short range, high-powered shots, these are not my 1st choice. I just come back from hog hunting with these in .308 (168gr) and was not impressed. We took 2 hogs with them - a head shot from about 25yds and a shoulder shot from about 10yds. Both bullets did basically explode on impact - leaving a 3/4" entrance hole and a sub-caliber exit wound. The shoulder shot actually blew liver out of the entrance wound. In comparison, the last hog we took (using a 165gr Deek Shok PSP) at 30yds yielded classic bullet expansion and a tremendous wound channel.
Both animals went right down without complaint, but this is not how a bullet should perform. However I do believe they will work better on longer-range shots (say 100yds) and on thinner-skinned game.