I have an 1886 in 40-82. I shoot quite alot, so I have a few loads.
260 grains, 28 grains 4198, 1500fps
260 grains, 50 grains 3031, 2000fps
Now I want a higher fps load with a 300-310 grain bullet.
300 grains and 2000 fps... but how do I know how much powder I need?
I know that a documented load of 34 grains of 3031 with a 260 and 300 grain bullet is 1500 fps.
How can it be if the bullet is heavier?
Is there an equation I can do or is it just add a few grains, shoot at a chrono, and test over and over? I dont own a chronograph