I am new to reloading and I am trying to make safe, dependable 9mm reloads for my UZI semi auto. I am using Sierra 115 grain FMJ bullets and Power Pistol powder. Alliant recommends a starting load of 6.0 grains and a max load of 6.7grains for this combination. Where the confusion comes in is that I checked Sierra's recomendation and it lists a starting load of 5.1 grains and a max of 6.0 grains. Hence the confusion. Both state not to go below the minimum load for a rifle application. Sierra FMJ bullets have the lead core exposed at the base of the bullet. Is this a factor? Velocities stated in the Sierra data are lower than for the alliant stated velocities. Now I'm nervious as to where to start. Has anyone run into this before? Has anyone used this combination before and do you have all your body parts still?