I bought a new gun/caliber so I am trying to see what perfoms best in my rifle. I am trying three different brands and weights of bullets and two different powders. I load in .02gr incriments. I try to use all the same brand brass. I also like to seat the bullet at different OAL to see how they perform. I use match primers for all my loadings. I like to load 9 rounds each combo so I can have a warm up group and shoot two groups. I let the gun cool inbetween each 3 round group and clean inbetween each 9 round test.