Well, the OP did specify he was looking for something low flash and minimal report so, I figured recommending a "stun grenade" load wasn't productive. Took no offense, meant none back. I just wanted it clear I wasn't recommending a +P load with the 125gr. XTP-JHP. BUT the load I was recommending, a 200gr. Cast Performance LWFN, over 4.2gr. of Unique is most definitely +P - CCI No.500 or Winchester SPS/M primers highly recommended - but still isn't difficult to manage recoil-wise, isn't terribly flashy, and it doesn't have a nasty report, in my experience.
The books say lots of things, and gel tests are really cool on UTube, but actually loading up and hitting a living critter with a load says some things very differently. I do load 125gr. XTP-JHP's over 5.0gr. of Unique and do shoot them out of a Rossi M68 3" .38Spl as my walkin'round on-the-hip gun sometimes - and I have used that load, in that gun, on nasty critters. It's not a flashy or blasty load - at least not outdoors at dusk when the critters are moving around looking for water and an easy meal - and it does some real damage for sure but, it didn't get deep like I thought it would and it didn't snap the pig's neck - despite a solid hit at 10' from a standing position - like a big-n-slow 200gr. CP-LWFN does, which the OP also mentioned as his preference. That's a real bone-crusher, even in a .38Spl 3". So, if the OP is looking for big damage with low flash and minimal report, a 5.0gr. load of Unique with the 125gr. XTP-JHP is good but maybe not as good as a near +P load with a 200gr. CP-LWFN - hitting hard, heavy-n-slow, punching through cartilage and bone, is right down that alley - but he needs to be aware a shot to the torso is called for because a miss will keep going and a limb/shoulder hit will pass-through. The XTP at around 850fps expanded to a little less than dime-size in less than 4" and spattered on the neck bone but the critter took off and ran off into the kudzu another 10 yards before dropping. If it hadn't lost the carotid and bled out it might have gone off too deep into the vines to follow a blood trail. What'll it do to a biped? Don't know. But I do keep that load in the speed-loaders in my desk in case the first five shots with the 200gr. loads aren't enough.
Just talking from personal experience with that load in a short-barreled .38Spl. for close-up work on semi-dangerous game. Good thing is, pigs can't read books so they don't know it's an underpowered load.