Reloading Plinking rounds for the 303 British.

try a .303-.305 round ball covered in grease placed into a full fire formed case(unsized) a small powder charge with enough fiber filler to take up the rest of the room in the case then place the ball in the neck the greae acts like a sabot and the ball can only grip the edge of the rifling this maes it act like a slow twist
 
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