CFE-P For 16'' PCC

Hello Fellow Reloaders

New to this site. Long time shooter and reloader.

Have built several PCC's. Most are 16' barrel, 9mm with blowback 9mm bolt

Interested in in hearing from any who have experience with CFE-P reloading for PCC's. I'm hoping that with a slightly slower burning powder I can achieve higher muzzle velocity in the longer barrels.

Thanks in advance for advice

BubbaJoe33