I reworked a Montana I had. The grip was terrible when I got it, almost a perfect rectangle.
I also drasticly cut the tips in height and length. It looked better, however before I did the tips I ran it thru the chrono. Before and after was identical. Not 1FPS change. So if you are expecting a more FPS by reworking Bear Montana tips, forget it.
Where there is a lot to be gained is by replacing the rope Bear calls a string with a good string like a 10 strand DF97, and padded loops.
Much faster, less vibration noise and shock, and it is able to be shot a a lower brace height with a good string adding even more to the performance.
Pete