I recently bought some for my super disc, but haven't shot them yet. My understanding... the Dead Center 260's are a favorite with many fast twist .45 shooters. The previous owner of my rifle said it loved them.
What sabot did you use as they are boat tails. How fast did you push them. I'm using a 45-70 bore(SML) conversion. I nthink I could use BH and slow em down some.