I know this is old hat to most of you guys, but all new to me. Thought I would share this for other newbies. I just acquired my first PCP, a Benjamin Marauder Field & Target .22. Of course I need a source of air. I ordered a Nomad II compressor, but will not get it for a few weeks. I decided that a pump would be a good back up anyway so I got an Air Venturi MK4 Hill with Dry-Pac system and it just arrived. I just finished charging my rifle. Set up was easy and straight forward. The actual filling was moderately hard. On the one hand I am a big guy ( 6' 1" @ 285lbs ) with an athletic background . On the other I am 67 with arthritis and a heart condition. I took my time and paused at the top and bottom of each stroke. I worked in 50 pump sets for the first 150, took a break and slowed down to 10 pump sets for the last 50. The 200 pumps got me to 2800 psi and it took about 10 minutes. The good news is that next time I won't start off so low. I am happy to say that I found this very doable. It is actually great exercise. Makes me question spending $650 for the Nomad II. (Not really, just kidding)