Ok, so here's the situation. I've googled and googled and haven't found an answer to my question. There's supposition and arguing, but nothing definitive. I have 3 firearms chambered in .357/.38 special. What I'm curious is what effect the barrel length will have on different powders, using the same cartridge, albeit within different firearms. I want to know how the noise levels will differ between them This is the only forum I could think of to post this question. Where could I get a decibel meter that could measure these kinds of sounds for the least money. If I find anything useful, I'll make sure to send the results out.