FPS out of a 4.49" barrel vs 3.46"

If it is not done with the same barrel and a hacksaw, anything about velocity versus barrel length is a great generalization. A recent gunzine had a chart of velocity of the same loads shot in guns with different barrel lengths. Most cases, that particular 4" was faster than that particular 6".

I would not make an inch of barrel length a big factor in a purchasing decision.
 
...just don't be suprised when factory ammo does not achieve advertised velocity when fired out of a short barrel ..... the ammo manufactures want an impressive number to put on the box, and may not be real open about the barrel length they achieved that in. Some do..... some don't.

As Jim Watson suggested, it also depends upon the barrel in question: the only way to know for sure is to try it over a chronograph.
 
I have seen three different guns with the same barrel length, shooting the same ammunition deliver 100fps difference over a chronograph.

Now, that's a bit extreme, but it does happen. Unless you chronograph the two specific guns in question, its all just a generalization, and exceptions seem about as common as the rule.

Don't get hung up on anybody's particular claim of xxxfps with load Z from gun A with barrel length Y. As the pirate says, "they aren't rules, more loik guidelines, really...arrrr..."

Each gun is an individual, some are "faster" and some are "slower" with a given load. Use published velocity figures as a general rule only, because while the odds are your gun is going to be somewhere close, it might not be. And that is entirely normal.
 
Sellior & Bellot for example make great ammo, but I've seen some of their pistol ammo rated for the velocity from an 8 inch barrel. :o
 
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