With the Brass shortage I find myself in a dilemma. I shoot .40/65 Black Powder and have been using Rem. Peters brass, but only have enough for one Match. I have some Starline and both are trimmed exactly the same. I am thinking of shooting the R/P in one Match and the Starline in the next. If the loads remains exactly the same, and I shoot only one brand at a Match, will there be that much difference. I usually have to re-adjust my sights at every Match anyway, but if the loads are consistent will there be that much group difference.