The only thing I'd shot previously in the Scandium snubbie previously was the Barnes TAC-XP 125 grain at 1200 fps - much more mild than a full house DoubleTap ammo.
I want to clarify that above - the only
.357 Magnum ammo I'd previously shot in a Scandium 360PD snubbie was Barnes TAC-XP. But over the past 5 years I have fired hundreds of rounds in .38 Spl +P at the range in the 360PD.
I'd settled on the Barnes 125 gr TAC-XP lead free as my EDC carry round, after shooting about 5 boxes of the stuff - I liked the performance in reviews, and found it to have manageable recoil. The .38 Spl ammo that I'd shot over that time included Buffalo Bore 158 gr EDIT
LHPSW LSWCHP at 1000 fps from a snubbie, .38 Spl Gold Dot 135 gr short barrel ammo, both of which I carry in my S&W model 637 Airlite. I also had plenty of old Corbon 147 gr flat point copper jacketed "match" ammo that I'd used up in practice, and I had also tried the Corbon 110 gr .38 Spl +P in the Scandium 360PD and S&W 637. In the 637, the Buffalo Bore 158 gr +p was my goto ammo for hikes and walking the dog at night, with the 135 gr Gold Dot short barrel or Corbon 110 gr DPX for self defense. (and 125 gr Barnes copper HP for the 360PD.)
I gave the 360PD to my son last month, and replaced it with the Model 340, but this trip to the range was my first time ever shooting the 340. I tried several brands of .357 with it, including American Gunner 125 gr, Barnes TAC-XP 125 gr and Vor-TX 140 gr copper, Ficchi 158 gr JHP, and finally the Corbon 158 gr bonded hollow point in case I need a bear load for hiking and walks.
The 158 gr .357 DoubleTap took me surprise, and was painful with the first shot. I quit at 7 rounds, had my son shoot 3 of them, and saved the last 10 for hiking in the country. It was ridiculous. I've ordered DoubleTap 125 grain Bonded JHP (Gold Dot bullets) to try next. The Barnes 140 gr lead free copper hollow point has good penetration and expansion from a snubbie in reviews, so that is what is in the 340 for dog walks at night. At other times I would carry 125 gr TAC-XP all copper HP for 2-legged predators.