I'm not familiar with the glock, but I saw a video of a water jug test, with 4 layers of denim in front, done with a Bersa UC 9 which has 3.2" barrel & it performed well. Good expansion & about 24" penetration, which is the equivalent of 16" in gel.
Most failures that I have seen was caused by the hollow point filling with denim & the round not expanding, making for expensive ball ammo & over penetration. I've even seen it happen with such as Hornady with their plastic nose which is supposed to prevent it, but didn't.
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