not something that i have ever tried, but i have seen numerous references to homemade spreader devices....two rectangles cut from thin rigid plastic - with dimensions dictated by available space (inner diameter of hull & height between undershot wad and osc). center cut each one to half the height, and slip them together to create an X, that will separate the shot charge into four equal parts - such a set-up has been cussed/discussed many times over the years as a possible spreader.
perhaps, look at using a thinner fiber wad(s) column - softer wad columns promote tighter patterns...so, logically harder wad columns should promote more open ones...
have also seen folks advocate using 1 or 2 thin disks (possibly some of the ultra thin overshot cards) interspersed amidst the shot charge....to separate the shot into 2 or 3 "compartments".
best regards,
tom
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