About the only time lower pressure means lower velocity is if you hand loaded a shell then kept everything the same but next time you used a little less powder. You'd then have less pressure and less velocity. Looking in my IMR handbook there's a 1100fps load at 7800psi and just down from it there's a 1200fps load at 5400psi. Different powder and primers. So you could have high pressure with low velocity. If you don't know, get it tested.
__________________
Paul Harm
|