I'm thinking someone should make a line of ammo specifically for defensive training schools like Gunsite, etc. Maybe figure out how to load 10 rounds or so per 100 in a mixed bag with either dud primers, or barely enough powder to exit the barrel, but not cycle the gun. Of course it would have to be clearly marked for training only. But it seems like the random failures would actually help during a defensive course. I'm sure you would have to figure out how to minimize the liability, like maybe anodize the brass red or something. But I'm thinking there wouldn't be a lot of liability because the only people buying it would know what it's for. The reason I came up with the idea is because the guns I shoot regularly are so reliable, I don't get a lot of clearance practice. I've had my G27 for 5+ years and never had it jam.