[bdjansen]

Does anybody know of a chart that lists how loud specific calibers are?

[Cesiumsponge]

There would be no such all-encompassing chart because it would vary even within one given caliber depending on barrel length, type of load, type of firearm, muzzle devices, etc.

[ozarkhillbilly]

If you want you can chart your own by buying a db meter, they range in price from $30.00 and up.

[Tyris]

There is *NO* $30 meter that has a fast enough rise time to capture a gun shot's peak.
You'll need a $3000 meter. Thats the price for a used one.

goto silencertalk.com and read the results page for some unsilenced testing results.

-T