At first I thought it was me, I had some bizarre flinch that was extremely repeatable. Infact several times I considered moving the sights because I could hit the same spot. So last night I was loading some gold dots I picked up, .40sw 180gr. I did 10x 5.3gr of W231, 10x 5.7gr of W231 and 10x 6.0 grains of Unique. I set the dies up and did all of the rounds at once, so they are a like. 1.125" COAL, Crimp 0.419". I fired off the W231 rounds first, and they all hit just above and center of POI. The Unique rounds like all of my other Unique rounds hit low and to the left.
I bought 8 pounds of unique to work out my flinch, but it may not be my flinch. Anyone have a similar experience? I am going to try some Different COALs, but my cast bullets don't feed as well at 1.135" as they do at 1.125".