Locks that work

I think that lock you refer may be rated at up to a maximum of 10 tonnes expansion breaking limit. So yes, bottle jacks rated at 20-30 tonnes should be able to break it. That's why its so important to fill the gap within the lock as completely as possible. A bottle jack that can't fit within the lock, is a bottle jack that cannot trouble you.

Didn't kryptonite release an attachment for their locks that is designed to stop them from being targeted by bottlejacks? If I remember correctly it is a hardened steel bar that slides diagonally over the shackle so that the jack cannot push against it. Will try to find photo.