Most small caliber PCP rifles come with 8 or 10 round magazines and you can usually always buy extra airgun magazines for a quick swap during a shooting session. There are even some custom airguns and mags that will give you 38 shots with .177 pellets. Those aren’t cheap, but 8 shots...
GX CS4 Portable PCP Air Compressor, 350W Powerful Motor,Max 5800Psi/40Mpa, Water and Fans Cooling, 5 Hours Continous Work, 12V Auto Stop,for PCP Air Rifle Paintball