For some reason I've had little luck with the lighter Partitions in mine. The Hornady 129s shot better, but still not great. I have had great results with the 140 grain partition and the 130 grain TSX, and I'm still tinkering with a load for the 120 TSX.
If someone has a tack driver combination in their Montana using the 100 or 125 grain partitions, I'd love to hear about it. I'd like to work up a light load using the 100 grainers for my daughter.
