Grumpy I'm getting ready to load some 300 Win Mag loads so I looked up IMR 4350 & there is such a difference in starting loads . The bullets are Hornaday SST 165 gr. What I found is Hornaday calling for 58.1 Gr. IMR 4350 to Pet Loads calling for 73.5 Gr. IMR 4350 others are 71.0 Gr.Nosler 70.0 Speer 67.0 Lyman I am leary to load theese because thats a big difference between weights