To even find out if there is a difference between the untrimmed metplat & a trimmed on would take a lot more specialized equipment , to truly do it in a scientific manor , so I agree with " Father 98 ", shoot more. ( just say , yes Dad ) <lmao>
Is this about your inconsistent COL , that you were talking about before & if so , you may want to look at your Bullet seater/ stem on your die . Try another brand seating die & see if it makes a difference .