Sorry Chuck, I must have missed the point about the relationship between twist rate and group size because of the pic in your OP. And you must have missed my point that twisting a bullet with the least rotation required to stabilize it, might work even better? So, here is a pic of some consecutive groups I shot with a hunting contour barrel I used last year ... with the least twist required to stabilize the bullet ... which I think provides some support for the practice of not over rotating bullets. I don't think it is credible to suggest that a single/fast twist rate is a "fits all" solution.
