Centershot:
That approach can work however I wouldn't advise buying the exact same components as your trap loads. If you are loading buckshot you will run into issues with stack height. Buckshot takes up more volume than does birdshot in any given weight. I ran into this problem when I first started loading buckshot. I ended up just buying wads with the shortest cushion leg and a set of gasket punches. My suggestion to anyone starting buck and slug loading is to have a good selection of card wads, fiber wads ect to adjust load column height. Or better yet just a selection of hollow punches that way you can punch your own wads.