Serious target shooters have standardized on 6" barreled revolvers for many years. They WANT a muzzle heavy gun.
I don't know about the etiquette, but I sure would not buy a gun without trying the trigger, unless it were one of the few that won't stand it. I can only think of Star automatics and Colt Mk III revolvers as centerfires not recommended to dryfire.
You could ask if they minded and if they wanted to supply snap caps.
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