Forest could be correct about bore sizes, but it's not something to worry a whole lot about. I use 10/12 Gaugemates to shoot 12 ga shells in my 10 and haven't ever noticed a performance problem. Of course brass shells look way cooler than plastic when shooting the old SxS's. At one time I had a 100+ brass 12ga shells and set up a Mec 650 to reload them [ not crimp ]. Even had a friend make up the parts so I could prime the hulls on the press. Got tired of cleaning the brass, and not figuring out how to load nitro in them; I sold them all to a cowboy shooter. Oh, save your money on the BPI booklet - you'll learn all you need to know, and more, right here.
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Paul Harm
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