Corey, good looking castings, your Knight sabots are the thickest in the pedal area I have found. your .451 sizer should work well with the knight sabots. I run all of my boolitz threw a .452 lee sizer, when I pluck them from the water drop bath. It has been my experience that the Harvester sabot is the most consistent in in giving repeatable load pressure on a sized .452 smooth sided cast boolit. I have not been able to get the same results with projectiles with lube grooves.

I believe they will shoot/work great for you, My cast boolitz are shot from both smokeless and BH209 guns. I have a Nephew that will be shooting them from a 1x48 twist side lock with 80 gr of AP 2F with used (once fired, picked up)Harvester sabots. They shoot minet of deer ( or should I say minet of frozen Crap pile out of my brothers shooting window)and he is Syked!

Go for it!