Aye, if there's nothing squishy and valuable to absorb their impact, bullets bounce off most hard surfaces. Kinda how physics work. Ideally hollow points expand and flatten when they hit someone to spread the force of the impact, but that's assuming it's landing into gelatinous flesh. Cause otherwise it's like any other bullets: a bit of metal that'll move at deadly speeds until it stops doing that and becomes metal pebble of sorts.