Stan- re Kim Rhode's Perazzi, she stated that it was an MX12 she was using, the model with COIL springs.

Dewey above states the engineering and physics of springs accurately. The point though is that in most cases it is easier and much less costly to deal with a broken coil than a V spring.

Price estimates for the replacement of the more exotic springs, those of Beesley actioned sidelocks and the Dickson Round Action equal the price of a fine condition used Perazzi MX8.

Stereotypes and anomalies is perhaps apt for a situation where SXSs has stopped developing. Ideally we should be able to get a modern SXS with the feel and handling of a best gun, minus the luxuries, at prices which are as affordable today as they were in the early 1900s.

Best guns were always costly. Yes, but they were affordable. I wrote about this before but it bears repeating. A Royal Navy captain earning 450 pound annually could afford a 100 pound best gun in 1920. Today the same gun, (Stereotpye?) made using cost cutting CNC machines, costs more than the total annual income of a captain (Anomaly?).