Just curious, when the police snipers have to shoot animals, do the sniper rifles they use become hunting rifles?
I would say no, because the police sniper rarely has to hunt the animal. Animal control rifle? maybe?
Sniper rifles are rifles used for sniping. No matter what they were intended for originally, if they were used for sniping, then you could call them sniper rifles.
There are purpose built sniper rifles, but a rifle need not be purpose built to be a sniper rifle.
A maker or marketer can hang any name on their product they wish, so that is another caetgory of sniper rifle.
Likewise, the term "sharpshooter" doesn't just apply to people shooting Sharps rifles...