dgang
Member
I recently started to load again for my .357 and I am confused about listed pressures. For example, using Alliant Unique powder a 158 gr. jacketed bullet can be loaded with 7.8 gr. of powder resulting in a velocity of 1280 fps and 33,200 psi. A lead bullet of the same weight can be loaded with 6.8 gr. of the same powder ( 12% reduction) with the same OAL resulting in 1295 fps but at a higher pressure of 33,900 psi. I understand that the lead bullet creates less friction so less powder can be used to obtain the same velocity, but I can't understand the increase in pressure using lead bullets and less powder.Anybody out ther have an explaination for this?
Thanks in advance, dgang
Thanks in advance, dgang