A Super Fox frame measures 2.420 across the breech balls, a standard frame is 2.350. Some non-supers were built on the 2.420 frame but the bores are a standard .729, the customer was looking for a heavy gun. A couple supers were built on standard frames but they are overbored like a standard super. Depending on the period super were bored .750, .745, .740 or most common .738.
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