The fffg is a finer granule than ffg. Therefore, 100 grains (in your volumetric measure) of fffg will have more weight than 100 grains of ffg. (You probably knew this, I'm just trying to be thorough) My choice is always the Triple 7 ffg for no other reason than that's all that Wal Mart handles. I would have to drive to Jackson for fffg. If I could get it locally, I'd use the fffg. Many claim that it ignites a bit quicker. Just use less fffg than ffg. I think a fair approximation would be 100 grains ffg (volume measured) is comparable to 85 grains of fffg. That is APPROXIMATELY. Hope this helps. By the way, I know several Encore users who prefer the fffg. And Omega users.