Oh come on a little fun.
I did see a 4 gun master fire and hit an IDPA target covered with a T shirt and the bullet was caught in the fabric of the t shirt - he caught a lot of hell for that.
As far as the post goes - it was either a partially blocked primer hole or a contaminated primer (wet) most likely - I have encountered both over time when reloading - having several in a row is quite unusual makes me wonder if perhaps the wrong powder was loaded - a rifle powder instead of a pistol powder.