The solution to the problem was given in Frank Srebro's recent post about shot bridging in his 9000 press. The nose of the ram tube is rolled in, to prevent the wad from being pulled back up. Rolling the end of the tube means the inside is also rolled in, (picture a choke) and the shot will bridge at that point. Reaming the inside of the tube eliminates the 'choke' and after that, it makes no difference how high up the tube is when you drop the shot.
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