I've shot the Speer240 grain in .430. The 270 grainin .430. The 250 grain in .452 and the 300 grain in .452 diameter. I have shot them out of MMP, Harvester, Knight, Crushed Rib, and Thompson Center Mag Express sabots but never out of the break away sabots.

The 240 & 270 shot well if you did not push them too hard and did not shoot long distances. So far the 250 & 300 grain are doing exceptionally well in the accuracy department.. I like to shoot the Thompson Center Mag Express Sabots when ever I can..