evening chaps

looking for some info,had an itch for a while now to get back into airgunning after a lot of years,at present i have a couple of rimfires but rarely use the .22 as i only use it on a couple of perms so am contemplating getting a brocock bantam .22 FAC to replace it,this will then do for those perms on rabbit and my other perms for pigeon and squirrel

so how may fills approx(gun bottle 480cc)would i get out of a 7ltr bottle and can i expect 100yd shots from this gun shooting at 30 ft lbs if i do my bit