I am using Lapua Brass, 30-06 necked down, then fire formed, neck turned and twice fired and annealed. Federal 210 primers.
I have H100V and 7828SSC to try when I get replenished Swift bullets.
I may try one of these with 140 bergers just to see if the rifle will stabilize them. The velocities I was getting were running between 70-100 fps better than what the data was estimating it would, so in my whacked out logic, it might work.
I may also see if the Hornady 129 interbonds do better than these Swifts for accuracy.
Interesting that you also hit an accuracy node at 3200. I think I can work backwards and save some legwork as it seems to be a trend. One data point is a dot, two is a line and three data points are a trend