Paul,
Steve and Gil are absolutely right. I cut down the 3-1/2" Federals using a retail tool (B&P or Precision Reloading?) and stuffed the hulls with Hodgsdon Longshot, some overpowder cards, a Remington SP-10 shotcup with 1-1/8 oz of lead, some fiber wads in the shotcup (cards and wads to make appropriate column length and to bring shot level to top of shotcut, respectively) then an overshot card and used an antique tool to give about a 1/4" roll crimp. Had Tom Armbrust guide me, testing early load. Load worked brilliantly on dove (when I could hold straight) and on guinea fowl (#7-1/2 and #6 respectively) in Namibia two months ago.
Also Found in Namibia that I was not quite burning all the Longshot and solicit comment on that from the Board.
Regards, Tim