Ray B,
My first double rifle was a Merkel SxS extractor model, in .375 H&H.
What I liked about it, was that it was accurate and affordable (in double rifle terms).
What I didn't like about it, was that one throat or bore was too tight and 23.something inch barrels are too short for my taste (what admittedly little taste I have) on double rifles / double shotguns.
Rimless chamberings don't appeal to you for doubles so, I won't rant all day long that the Merkel has but one extractor pawl / plunger per cartridge.
Two per cartridge is preferable for rimless calibers (I feel better now.)
I am convinced that my bum chamber experience was an exception rather than a rule from the Merkel factory.
JJ Perodeau claw mounted this rifle for me and re-regulated it to my favorite .375 "bush load" of 300 gr round nose at 2400 fps (low pressure).
No more flat or pierced primers, very accurate as well and ballistic twin of the old Pre-War ".375 Flanged load for tropical hunting".
So still plenty of punch for Africa / Alaska.
If Merkel was offering their plain grade double rifles (like I had) with 26" barrels, I would definitely consider buying another one some day, but now their ejectors are affordable, much to my preference.
I'd probably get it in 450/400 this time.
You could do a lot worse than the Merkel.
One thing I would avoid is anything they make today with "game scene engraving" on it.
Merkel seems to think that a Labrador retriever with a one dimensional horn boss looks like a buffalo and the same dog with shaggy mane looks like a lion I guess.
Their elephant always seem to look like pumpkins with tusks.
All that being said, my only double now is a Heym 88B that I bought 2nd hand but in excellent or better condition for $12,500.
It has 25+ inch ejector barrels and special order, fancy wood plus, only sparse scroll engraving, which I definitely prefer.
Unless Leonardo DaVinci himself is the engraver, I do not prefer to have Mr. Buford Billy-Bob Slapnuts, gouging his version of animals into my firearms.
The fit and finish, as well as "intersepting sears" (less chance of doubling) in the Heym, (plus longer barrels seem to be standard with them), are reasons enough that currently, I'd rather save up for 2 or 3 extra years, and just buy a Heym in the first place.
My used Heym only cost me a tad bit more than a new Merkel so, I am very content at this stage.
Enjoy your search, it's part of the fun,
Velo Dog.