"Automatic" hearing protection (for outdoors shooting) is a largely 1980s+ invention. Thirty plus years ago it was not uncommon (if stupid) for folks to regularly shoot (as in informal target and plinking) outdoors with all sorts of calibers and almost always .22--without hearing protection. A year ago I had my hearing tested for the first time in over thirty years...as a matter of a physical, not complaint of hearing loss. And I was actually surprised (at first) when the technician noted hi frequency loss in the left ear. I thought I had perfect hearing 'til he said I didn't raise my hand always when I should have...and certainly hope that loss does not increase measurably at least any time soon to the point of being noticeable--or worse. But, I'm a LH shooter and it started to make sense. When younger, other than the ubiquitous .22, most of my "plinking" was with an M-1 carbine and while, in actuality, it has a fairly sharp report--compared to a .22 certainly--it was still nothing like the whump of the family .30-30 and .270. Growing up in the 60s it was just something family, friends and just about everybody I knew did (outdoors) without--obviously--thinking about it, as bad/idiotic as that "sounds" now. (Though I never indulged, sounds a bit like smoking in days of yore too?) I remember doing this as recently with my then new Ruger .32 Mag in 1984. I usually had plugs handy for prolonged shooting but admit I shot a few occasionally without--and while ear ringing or muffling ensued for a half hour or so, didn't think that much about it beyond. (Wow, that was back when you could actually afford to do that stuff, and find a place for it!!). Now, with .22s, I'd at least put in the cheap, small foam plugs. Doesn't answer your Sig vs .357 Mag uestion either, but I'll echo others' comments and say "don't."