As far as I know, all 10ga shells are straight walled. If pressures are kept low, any 10ga shell could be used. Now some of you guys shoot a little higher pressures, so it could make a difference what shell is used. Anything at 9000 or under and I wouldn't worry what hull it is. A friend gives me once fired 10ga hulls he picks up at the local DNR range - Win, Rem, and Fed hulls; and all of them are high brass. I've never seen a low brass hull. At least not the modern ones made now a days. I use the same formula for all of them. JMHO
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Paul Harm
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