I have been wondering if different primers might affect bullet velocity. Here are the results (each average velocity, below, was from a 10 shot group):
VV N350, 7.5grns, 124 FMJ-RN
1,344 ft/sec - Winchester small pistol magnum (WSPM)
1,355 ft/sec - Winchester small pistol regular (No. 1-1/2 - 108)
1,313 ft/sec - Federal small pistol magnum (No.200)
1,313 ft/sec - CCI small pistol magnum (550)