It is suggested that 3f does ignite faster, but the degree of difference is so short that many claim it can not be noticed. I personally would have to agree with that. The important difference between 3f & 2f is the 3f burning faster produces more barrel pressures and hence a little more velocity in the projectiles.

Many people claim better accuracy, and less fowling with the 3f powder. I personally shoot 3f in a lot of my rifles.