I have older S&W Model 49 and 36 I've been shooting standard pressure 38 special ammo in. When I was shopping for standard pressure ammo during the ammo short supply MagTech was the only standard pressure ammo I found and I did stock up.
My understanding is 38 special has been downloaded in factory ammunition and maybe current plus-P ammo is at pressures equal to the old standard 38 special ammo. Would this be correct as I'm hearing such on another gun forum and internet claims make me suspicious always.

So my question is would I be safe shooting today's plus-Ps in older J frames on occasion and for carry or would I be better off using standard pressure 38s in them as I have?