For all who still use revolvers this .22 LR Round is fast and powerful for its size. Also, after firing, the casing does not expand too much so it sticks in the cylinder of your revolver. This is a known issue with some revolver cylinders, but with the Remington Viper's thick casing walls the expansion is unnoticeable so empty casings slide out butt first as easily as they went in.

Pro: I didn't chrono any, but these hyper velocity rounds felt like they had more punch than high velocity 22LR ammo. Con: Almost all the bullets were alarmingly loose in their casings. I experienced numerous failures to feed, eject and fire in the same box, and my 10/22 is not usually a picky eater.

These cycle through my Ruger Mark III Hunter as fast as you can hit the trigger. I don't believe that any more than a few of these have been duds out of the good 3000 I've shot. It's not like my life depends on it either in this case so I'm very happy with them.

i have shot through 2 bricks so far between single shot saturday night special and 100 roundclips as fast as i could squeeze trigger and slow or steaady firing one dud and no low loads...good as match njoy

They cycle great, accurate...... When they decide to fire. One malfuntion per magazine sometimes more. Maybe I got a bad batch, you be the judge.