What'd you say?
I've been to an indoor range where some of the fast 9mm and .40 S&W loads sounded just as obnoxious as the 357 Sig. Another way to look at it is that the 357 Sig did not sound any worse than these hot 9mm and .40 rounds did. In fact, I thought they were shooting a 357 Sig until I asked.
As for flash, there are low flash 357 Sig rounds that are very mellow, especially when compared to the flash of a 357 Magnum revolver.
I've been to an indoor range where some of the fast 9mm and .40 S&W loads sounded just as obnoxious as the 357 Sig. Another way to look at it is that the 357 Sig did not sound any worse than these hot 9mm and .40 rounds did. In fact, I thought they were shooting a 357 Sig until I asked.
As for flash, there are low flash 357 Sig rounds that are very mellow, especially when compared to the flash of a 357 Magnum revolver.