I don't have a 586,or 686. Although I have shot them , some years ago.
My python has not been shot for at least 14 years. But I can honestly say that ...my python, and a friend's Boa , were the revolvers that would shoot a x ring in the bullseye on the first shot... cold bore shot.
This happened very often, in my , good earlier years and with my sharper younger eyes. my 30's.

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Dino in Pittsburgh's Rat Pack