'Handloader" magazine Published a book/phamplet about this, as I recall the best results were with duplex loads with the tube about 2/3 the length of the powder column. I'll try to find that book again.
I'd appreciate any info you have. The story I've always gotten is that there is an increase in performance, but its so much trouble that it wasn't worth it. Can you imagine taking the heavy loads we're using today and say, adding 150 fps to them? A Buffalo Bore or Sledgehammer already giving incredible performance and adding to them??
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