At SAAMI recommended seating depth of 2.800 and case trim length of 2.005:
For a 22 inch barrel:
At 60 deg. F. = 2442 fps and 28537 psi
at 50 deg. F. = 2424 fps and 27963 psi
At 40 deg. F. = 2405 fps and 27408 psi
For a 16 in barrel:
At 60 deg. F. = 2221 fps and 28537 psi
at 50 deg. F. = 2204 fps and 27963 psi
At 40 deg. F. = 2186 fps and 27408 psi
The effects of temperature are essentially linear.
Changing seating depth will change the velocity and pressure but changing the seating depth by 0.01 will only cause a 4 fps change in velocity.
Changing the trim length by 0.01 will change will only cause a 4 fps change in velocity.
Increasing seating depth decreases velocity and pressure and increasing trim length increases velocity and pressure.
Bookmarks