Hi, I'm new here. Looking to find and share handloading wisdom. I have picked up some newer bullets over the last year and cannot find load data for the cartridges I want to put them in. I thought before I started with a similar heavier bullet and worked it up I would ask if anyone has loaded Speer Impact 172 gr .308 in a 300 H&H? Data exists for 300 win mag, but not 300 H&H. The other, I have some Sierra Game Changers .284 165 gr. I wanted to put them in a 7mm STW. Again, no load data. Not sure if anyone can help, but I thought I would ask before reinventing the wheel.