Does anyone have any experience or thoughts on the Federal EFMJ XM40LP1 rounds? Ammoman has what seems like a good deal on them and I'm interested in this type of round for protection carry. I have kids and live in a neighborhood with close, thin-walled houses so over-penetration is a big concern for me. I've been carrying Glaser Safety Slugs but the cost per round is so high that practice fire with them is ridiculously expensive. Was just wondering if anyone has experience with this particular brand/type as this brings the cost of practice down out of the stratosphere.