mate, it'll be fine. the only exception is if you are shooting very close up, say less than 15 yards. Even then, at 3x mag, it will still be fine, but you will have some parallax error. with a 30 yardd PX, 20-40 yards is near as makes no, unless you are using 20+ mag. At say 10 mag, no issues at all.

Best thing you can do is ignore my advice, and any other for that matter, and set yourself up some card targets at 10-40 yards. Set you scope to 30 yards PX, your mag to whatever you like but no more than 10, and shoot some groups at each range. You will quickly determine if it's suitable for hunting at those ranges, whether the clarity is acceptable, etc. And as a bonus you get to work out you holdover points for loopy sub 12 airguns