This is some potent .380 ammo. Put two mags through Elsie to make sure it cycles properly. No problems to report but lord those things feel like I'm shooting my 442 with +p ammo. I'm glad it wasn't pleasant to shoot because it forced me to only fire off two mags of that expensive ammo. I have complete confidence in them and definitely feel those on the receiving end of those rounds will be in a world of hurt. That goes for any of the modern .380 SD ammo but check these out if you can. Definitely notice the extra oomph with the underwood. Rapid shooting at 7 yards and I kept them all in the Coke bottle. Good Stuff.