Racoons leave a scent trail when they find a food source, either your chickens or your neighbors hand out, it lets them find their way back, but it also lets other coons find that trail and open invitation to a block party. Sudden increase in numbers means all the invitations are out...good thing is you prob put a dent in the numbers but sill have more work to do. Un fortunately, thanks to the hand outs, this will be an ongoing problem..anybody that feeds coons is, well, not the sharpest tool in the shed.
The changes is the weather could have something to do with it, not alot documented on all the weird events happening, like, no acorns this year, so it'll be a bad winter for the deer that live off them (and other critters too) Who knew global warming would do all this?? Oh , yeah, the scientists, now I remember.
Oh, imp? Look into law on pellet guns, it is still a firearm and may too be illegal. There are other creative effective measures other than discharging a weapon in the neighborhood, but I won't go on about that.