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I am going to start casting my own lead for my .44 mag super blackhawk. It will be used for IHMSA shooting and everything else. Myquestion is when leading into the 1200 fps range, is a gas check needed. I must get the right mould the first time so I need and education on the subject. Any...

Is there a formula that allows me to compute trajectory? As my manuals only offer this info in 100 yard increments I am curious as to what would happen if I moved my point of impact by 25 yards. I don't seem to have enough time to sit down and shoot it out so I must compute it out.

Does anyone know the method of calculating cup pressure? I generally use this number for determining generated recoil, and as most of my loads fall in-between the lines the cup pressure usually isn't listed.