Why are so you interested in the Silvertips?
I use 300 grain Federal Hi-Shocks and Nosler Partitions. The partitions are about $45 a box, but the Hi-Shocks are about $25 a box (if I remember correctly.)
In my .375H&H, I can put 3 bullets almost in the same hole at 100 yards. Performance on game is deadly, and it appears that the partitions are deadlier because they expand more in the begining, yet have the mini-solid in the rear to push it through.
Zachary