I was looking through my load notes binder this afternoon and noticed something weird. The 3 loads I tested one day were a 158swc over Bullseye powder, CCI550 primer. My first was 5.9gr and made 1103fps (average), second load 6.1gr and showed 1271fps, third load 6.3gr but only 1148fps! Did I mis-label my loads before shooting or maybe transpose the info incorrectly, or will this combo do strange things with pressure or velocity?