I guess going to a scuba shop to fill up a tank and pumping up a rifle gets old quick. When I'm shooting springers...I take about 20 seconds for one shot.....break barrel, load, close barrel, bring gun to shoulder, aim and shoot....and repeat sequence.
Now that I've 2 PCP rifles.....10 shot repeaters....takes about 30 seconds to load up a clip, stick in into the gun, bring gun to shoulder, aim and shoot, keep gun there and cock gun again and keep on shooting until clip runs out. The shooting sequence takes about 15 seconds. Using alot more pellets quicker. heh heh After 40 shots, need to pump (90 strokes)the rifle up again. Working up a sweat in the process. I can understand PCP owners getting a scuba tank or in your case.....a compressor.