Who has been experimenting with the different grain weights of the ammo they use in a 9mm P226? What differences have you noticed in your gun's performance between 115, 124, and 147 grain? Thanks!

Hi - all. Just bought my first AR. A Sig516. 16inch barrel, 1:7 twist. What is the best grain to use for 50-100yds at the range? Everyday plinking use. Thx!