My family has a 50 acre farm in the northwest part of the state and hunters usually take up to 20 deer per hunting season. I used to count herds of up to 50 deer roaming the hay fields in summer.
Wolves are not an option in NJ and while coyotes have come back I don't think they take down deer.
Instead, this beneficial activity has been driven underground. We hear the deer being poached at night (when the poachers are using rifles). I imagine the more stealthy poachers are using crossbows.
Most poached deer where I am (Arkansas) are taken with small-caliber rifles - mostly .22 LR, but some .22 Mag and .17 HMR. They’re still loud but not nearly as loud as a centerfire rifle cartridge. They’re also generally extremely accurate and inexpensive.