Ummmm...if the gun is old and/or delicate, a 110 grain jacketed load even if still under "+P" spec is going to be harsh. Personally, I'd think twice on that Cor-Bon for those situations.
(Sidenote: I really want to see independent test data on the DPX 110. If it *works* as claimed, it's a killer alternative for those wanting low recoil either because they're very recoil sensitive (arthritis? etc...) OR they've bought one of the 10oz superlight aluminum S&Ws and the recoil is too harsh for 'em with +Ps. There is a NEED in this world for an effective "granny gun load".)
The Safestop makes sense for most folks. Handloading a 148 lead hollow-base wadcutter backwards at around 775 - 800fps (from a 2") with a careful powder selection makes a LOT of sense, if you're willing to risk the "handload evil thing" in court. (In this case, it wouldn't be too bad: you explain that modern defense loads are too stout for this old gun, so you optimized something that would work at reduced pressures, speeds and energy levels...)
All that said: the Winchester and Remington 158grain plain lead hollowpoints may be "+P" but they're still pretty mild on the gun for a number of reasons...soft lead isn't stressful on the forcing cone, neither are the heavier weight slugs if the energy is reasonable. I would guess that even a 1920s-era M&P or equivelent in GOOD shape, thoroughly examined and tested first with mild 148 lead target wadcutters or similar, could handle a small diet of the 158 lead +Ps. SMALL diet...like 20 or 30 to dial in point of aim, and then a cylinder or two a month to keep in practice, do the rest of your practice in 148 lead target wadcutter (mildest factory 38spl made). I would still measure things like endshake and cylinder gap before and after such mild uses of mild "+P" just to set my mind at ease.
Now, I'm not *certain* of that, and somebody may be along to say otherwise and I'll listen carefully. Make your own decision after inspecting YOUR gun if pressing an antique into a defensive role. But I suspect I'm right. I've seen convincing evidence that 1920s/30s/etc loads called "standard pressure" back then would be called "+P" today
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