The Thor bullet is constructed almost exactly like the new Federals, so if your gun shoots the Thors well, there would not be any reason to switch (unless you can't get the Thors)
I like the FPB 350 too for elk and between my brother and I have taken 3 elk with them. But both the Thor and new federal are tougher bullets.
txhunter58
venor, ergo sum (I hunt, therefore I am)