The standard hammerless frame size (and the only one I have ever seen) for an 8g was the 6 frame. That is a big difference from 3 to 6. As Bill stated, it is pretty much a physical impossibility for an 8g to be built on a 3 frame. Parker did build some super heavy 10s on the 6 frame.
The 4 frame is more of a hammer gun frame size, 7 as well. Come to think of it... was a 5 frame ever made in any configuration? I have never heard of it.
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B. Dudley
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