Are those spherical powders?? I was thinking about trying a spherical powder, i was told they meter better then extruded type powders like varget. is that ture?

alright since the powder charge cat is about killed, I have another question about adjusting bullet seat depth. in the past all I ever loaded was canilured type bullets Id seat it so the canilure was just barely exposed from the mouth then I would use a slight crimp. but now with sierra's Im using no crimp but need to figure out a good seating depth. My starting col will be 2.750 and will work it up to 2.800 what kind of increments should I use? should I go by 100ths or thousandths?