well that was interesting....Ive got cowboy action shotsell loaddata for 1oz loads with ap 30 and ap50 think thats the only two...and believe you have some of one????
the load data is with plastic wad........BUT heres a theory for you.....others with more experience feel free to chime in and blast if Im way off track here.....
TRY the load recipe for a 1 oz target load with components you have got BUT take petals off wad,maybe leave just 1/2'' and see how the column LOOKS in your 2 1/2" case.....also,if you roll crimp rather than star crimp you can get away with longer load in shorter chamber BECAUSE there are no case petals to jam into the leade....the shorter ones will still be in the wide chamber section.....I KNOW you can use a 3" roll crimped load in 2 3/4" gun safely....lots of buckshot loads measure up like this.....rio mini mag were the same. by taking the petals off you will reduce the volume of space taken up and it MAY JUST drop column low enough to work
worst case you place an overshot card on top of shot column and add couple of dabs of nail varnish etc to hold it in place inside the case.....
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