I recently purchased a .22 Hatsan Gladius. Several reviews had stated it to be pellet picky and had noted H&N Barracuda's shot well for most of the reviewers so I ordered some before I received the rifle. They did shoot well. Crosman Premier Hollow Points by far shoot best in that rifle. Probably will depend on each person's individual rifle.
I've had my Gladius for a while now, and it really likes H&Ks and JSBs [When the JSBs aren't all mutilated straight out of the tin]
They fire best on the higher power settings - usually levels 5 and 6.
For indoor plinking at my 10 meter range, I'll put it on power levels 3 and 4 and shoot the Crosman Premiers.. They Work Amazing!
I had 3 out of 4 PCP rifles that Loved them. Now I have 5 out of 6. Every Single Tin Of CPs has had nearly perfect pellets in it!
Like I said before, I just snag the 600 count tins at WallyWorld if/when I'm there. I've gone through at least 4 full tins now,
only had to throw out a few pellets here and there, and I have a few more tins still to go through..
Anyways..
You brought up the Gladius firing them - So, here's a video of My Gladius firing them.. I actually just posted it this week:
https://www.youtube.com/watch?v=NDIy29cuDQ4
Here's a list of my guns that absolutely love the CPs [in .22 cal / 14.3gr]
ATI Nova Vista Freedom, Hatsan Gladius, Kral Puncher Breaker, Artemis P15, Artemis PP700S-A [Pistol]
The only rifle so far that doesn't like them - and spits em' out like a shotgun birdshot pattern is my Kral Puncher Nemesis..
That rifle - Even on power-level 1 just seems to be just a bit too powerful. Too any FPS - at least for close-range..
Sam -