Semisane
I have on one occasion that i remember... I was shooting BH-209 using a Lehigh Conversion. I kept the powder and the bullet constant but switch seven different primers if I remember right.
There was some movement in POI but not enough to be significant and the FPS stayed very close also.... Again not enough to raise a concern.
I could probably find the target and velocity information stored in photobucket someplace.
I ran this as more of an experiment for Tom than anything else.