Originally Posted by axxe55
personally IMO, you are overthinking this. dwelling on factors that don't even need to considered. go to a gun store or range and shoot some pistols in different calibers and types, and find one that suits you. buy it and practice with it on a regular basis and become profficient with it and forget about the loud noise it might make if in the remotest of chances you might have to use it to defend yourself with it.
If you knew the amount of research I did on basically everything, it would probably drive you nuts. Personally I think too many people don't research things thoroughly enough, I do my best to consider all factors beforehand. I'm just afraid going to the range and comparing them they're all going to sound about the same through my earmuffs, but that without them there might be a more appreciable difference (But I'm not even about to fire a shot without them on).
The only list I found was the one here: http://keepandbeararms.com/information/XcIBViewItem.asp?ID=2052
For the relevant calibers I mentioned is
.38 Spl 156.3 dB
9mm 159.8 dB
.45 ACP 157.0 dB
So this reinforces the idea to me that the 9mm is the loudest because of the velocity which it travels, whereas the .38 and .45 are slower calibers in general. Based on that list, there's minimally any difference between the .38 and .45 - but I've always thought the 9mm was supposed to be quieter than the .45? 3 dB difference will sound twice as loud, which is rather noticeable.
I'm thinking I'll end up comparing a 9mm and .45 caliber pistol at this point, but I'm still happy to hear thoughts on the loudness of these calibers. I know the frequency is supposed to factor as well, 9mm being a bit higher and .45 being a bit lower I believe. Again, I'm not a gun expert by any stretch I'm just trying to comprehend all the data I've looked at.
P.S. I'll be able to handle a .45 or 9mm fine either way (I shot a .45 once before and as I said it was easy to handle - though again I shot a 1911 style not like the XD-S), I don't have a big concern about that - I'm sure there's an appropriate gun for me in either caliber. But if we threw the .357 magnum into this comparison, wouldn't you agree that's rather excessively loud and a bit more difficult to handle compared to a .45 or 9mm and for what appreciable benefit for SD? Sure, if it's life or death you use whatever - but if you could choose and you're an equally good shot with both say a .45 and a .357 wouldn't you go for the .45 assuming there's no noticeable need for the .357 at the distance you would be engaging?