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Old November 13, 2012, 05:06 PM   #6
Billy Shears
Senior Member
Join Date: January 17, 2011
Posts: 606
I don't have evidence to back this up, but intuitively it seems to me that you might have a noticeable noise increase when going to a 4" barrel from a 5" barrel based on the powder in your cartridges.

A full load of a slow burning powder like H-110 may very well be still expanding violently when it exits a 4" muzzle. The extra length of a 5" barrel may (or may not) make an audible difference in such a case.

On the other hand, a load of a quick burner like Unique may have already reached peak pressure much earlier in either barrel and the noise difference would be negligible.

Just a couple of random thoughts with no empirical evidence to support them.
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