Here is a web page that shows how barrel length relates to various firearms and commercial ammo.

BBTI - Ballistics by the Inch :: .357 Mag Results

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Mike

BBI's site has been around for quite awhile, and it's great for indicating generally how the MVs of various loads are affected by factors such as barrel length and cylinder-barrel jump. But, especially as regards revolvers, don't automatically assume you will get similar results from YOUR revolver and YOUR loads. It's always better to get a chronograph to see how your loads perform from your revolver than believing anything you see in a reloading manual or on a website.

DWalt is correct. My 6" Model 28 chronos slower than my 4".

...that us reloaders need. People in the powder, components, gun and ammo business seem to think that the less we know, the better. The info on this site should have been available all along, but it's up to individuals to provide it and make it public. Thanks to the people who do that.

It would just be better if the manufacturers weren't so cagey. They have the capability and know how. They should accept that there are a lot of reloaders out there. If they published their data, it would be more from the horse's mouth.

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"He was kinda funny lookin'"

This doesn't get acknowledged enough on the forums. Great Web site! My own chrony work between my Marlin 1894s and my SA revolvers correlates closely. I'm getting muzzle energy on .44 Magnums that rivals some low end 45-70 factory loads.

"It would just be better if the manufacturers weren't so cagey. They have the capability and know how. They should accept that there are a lot of reloaders out there. If they published their data, it would be more from the horse's mouth."

I assume you mean the ammo manufacturers, Remington, Winchester, Federal, etc. They use propellants available only to them, not the usual canister powders as sold to reloaders. The ammo manufacturers must test each lot of propellant they buy to develop safe loads with it, as it will differ in its properties from the previous lot. They can't publish reloading data using propellants you can't get.