The spring air rifles have a lot of oil in the air chamber and will smoke and be very loud until the excess is shot out. It will quiet down after about 40 pellets depending on how much oil there is. Your zero wont settle down until it stops smoking. It will also be loud with the alloy pellets as they break the sound barrier.
"I would not be an old man if I had not been an armed young man." JTJ
Patron Member NRA
"If you have always believed that everyone should play by the same rules and be judged by the same standards, that would have gotten you labeled as a radical 60 years ago, a liberal 30 years ago and a racist today"