ok, this is just one example i ran into while trying to dial in my 300wby.
I bought a book from sportsmanware house called THE COMPLETE RELOADING MANUAL FOR THE .300 WBY
here is data out of that book,I will post pictuers on here monday so you can see for yourselfs Please explain the difference in fps with corrasponding grains of powder ,) sorry i am stupid but i need help. 2 DIFFERENT MANUALS LISTED BELOW
this is for the #3070 hornady sp bullet
......................2700fps.........2800fps.............2900fps ........ 3000fps
IMR 4350.....69.2GR.... .....71.7GR.............74.2GR...........76.7 (max load)
This is out of HORNADY BOOK
.......................2800fps........2900fps..........3000fps..........3100fps
IMR 4350.......64.8gr..............67.3..............69.7................72.2gr (max load)