Steve C
Member
I shoot both .38's and .357 mags from by .357 chambered revolvers, probably 60/40 38's to 357's.Own enough .38's so I never load .38 brass to magnum pressures.
However:: After shooting the shorter .38 Special in the .357 cylinder, a ring of fouling will form in the front of the cylinder. When you shoot a .357 Magnum full power load, the brassw will expand into that fouling ring, and make ejection difficult to impossible without a rawhide mallet.
Bottom line: yes you can do it, but keep that .357 cylinder scrubbed clean. As you should do anyway.
Funny thing is, the M686 was developed to fix that problem the K frames were having so you can shoot all the 110gr and 125gr you want through your M686. I never did have a problem with forcing cones because I like shooting 158gr bullets in my .38 Special and .357 Magnum loads.When I was wet behind the ears,young and did not know any better I shot lots of magnum load out of my mod. 19 6" from
110 to 160 Speer semi-jackets. With all the super fast loads I finally cracked the forcing cone and learned a valuable lesson
on how not to treat a super nice revolver.
Today I shoot factory and my reloads out of a 6" S&W 686 but no more super hot 110Jhp's and I keep the 125's at 1450fps but most are around 1250fps to make this pistol last a lot longer. I would say that 80% of my loads are 38 spl, just because they are easy on the wallet and fun to tinker with but I still enjoy a good "BANG" now and then and some 200 yard shots with iron sights, just for giggles. (not hunting)
I recently have stopped shooting .38s out of my 686 and now only shoot .357 magnum. For some reason I'm more accurate with the .357s and I prefer them for practice.