A bit more heresy from me.

What scopes do you recommend for use on double rifles and why?

My first use will be on my Tikka U/O DR so no big problem there. I have a set of DR barrels in 9.3x74R and .30-06. Plus 12g combination barrels in 12g and .223 and also 7x65R.

For the future what recommendations on something in the range of a .375 or .400 side by side?

Also does anyone like Schmidt & Bender, Swarovski and Zeiss still make neat little fixed power scopes in say 2x or 2 1/2x?

If not those brands, which brands?

Do most guys get a scope with a rail for doubles or ... ?