Do you notice any difference in poi, velocities, etc.... and do you think it matters more as you go to higher velocity and pressure?
The reason I ask is that I have a mixed bag of brass for my 44 magnum and at my favorite load,about 1280 FPS with a 265 grain swc, it doesn’t seem to matter a lot. When I load for upper end 454 casull it seems to make a very noticeable difference. When I used to load for my rifle I never mixed brass either.