9mm Para + 135 gr coated + HP38.
I chronographed with every primer I could lay hands on, SP, SR, SP magnum.
Seven out of eight were the same, within one standard deviation overlap.
Remington 1 1/2 SP standard was a little faster than the magnums and rifles and other SP.
Magnum LP gave somewhat higher velocity in .45 ACP than standard LP but I was shooting powderpuff loads with Bullseye.