$850 is high for a Ruger Blackhawk.
Your Winchester is worth more than $850
I'd keep the Winchester.
Now if he added an additional gun to the trade, depending on what it is, that's a different story. I'd still probably keep that Winchester, because of it's configuration.
Well, after straying away from 1911s for several years, I find myself back again. I've recently fallen in love with the wonder called 10mm.
Shooting a G4 Glock 20 and Sig P220-10 has me hooked.
Well I recently acquired another 1911 and have an SR1911 CMD on layaway.
So I must ask, which...
Maybe the Ruger SR series is like the S&W SD series and the American series is like the M&P series. Wonder where the 9E fits in. IMHO it's a far superior weapon to the SD9