Yes, it's a single shot. The trigger pull is "exactly" two pounds, the minimum allowed in competition. If you don't lift the pisol with the weight hanging on the trigger slowly, it will fire.

The velocity is IIRC 550 FPS or so. And quite consitant which is even more important. I have two cylinders. The fellow I bought it from suggested placing the empty cylinders in the freezer for a while before filling. Get more inside if the cylinder's pre-chilled.

There's a little lever on top that opens the chamber so you can insert a pellet. Also cocks the hammer. Don't remember the shots per fill. but when the pressure drops to a set point, the remaining charge is vented, so you don't shoot with inadequate pressure.

I've not shot the gun in several years, maybe 8 or 9, but the serious competitors had a pellet sizer that they'd press each pellet through before firing. These are serious folks.