[Molon Labbie]

Hollowpoints are not for practice.

[Cvengr]

Target practice usually favors a round which doesn’t deform, so multiple shots may be scored on the target.

[Hugin]

You can practice with them, and it makes sense to practice with the same round you would use in the real world. In fact in a lot of action shooting facilities you cannot use FMJ bullets. They have to be soft. It may also be simpler logistically to just stock one type of ammp instead of two.