"Is there a large gain to be had from a 6 inch barrel or is it just marginal?"
You'd have to be more specific with the question. 'Gain' in terms of velocity ? or what - -
As everyone else has mentioned, 'it depends' on what you are asking about, the specific gun, and the individual.
I personally prefer to go with revolvers in the 4"-5 1/2" barrel length range for general holster carry and field use.
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