Yes, 3F burns faster than 2f because with the same charge there is more surface. And faster burning = higher pressure=higher velocity. So 75 gr of 3f vs 75 gr of 2f your POI may change and your accuracy may also be different (better or worse). You never know, you may like the 3F better. I have 2 sidelocks that eat up Pyro P which is basically the same (a .45 and a 50)and one that likes BP FFFg.