My father is going elk hunting next fall so I decided to work up some loads for him. He has a Weatherby MKV in 300 Weatherby Mag. I picked up a box of 180grn Barnes triple shock bullets and planned on using the H4350 that I have. When I looked for data it seems like everyone has data for the Barnes TSX 150 but not for the 180. I found load data for the speer 180 grain SPBT with the H4350 but but not the Barnes. Could I used that data with the Barnes as a starting point?