"Best Guns" is a social, marketing ploy out of London after the turn of the eighteenth century.

The phrase does tend to connote a gun stocked to the fences, chopper lump barrels and no through lumps.

Best guns prior to that period were known to not be all of those.

This is well-documented for Boss, Purdey, Woodward and H&H.

Crossed Chisels will no doubt be along to help us with this non-issue.