Or using firearms to do the same thing. I've shot everything from a matchlock to an anti-tank missile and anything in between and I'm telling you no small arms projectile would cleanly snap a chain lock! The only time you could sever the chain is if you hit with a high-explosive projectile from an artillery piece or an RPG or M203 HE round, but that'd blow up everything around the chain as well.
So you're saying it would be unlocked though?