Okay, I'm tired of looking for Hornady's Critcal Defense for a reasonable price. Here's a thought. I've done some prototyping using a mold making 2-part silicone rubber called OOMOO 25. Once it hardens, it is very flexible yet dense/firm. It is poured and does not retain air bubbles. What I'm going to try is to fill the HP cavity in my Federal Hydra shok self defense loads with this rubber. I'll need to make some gelatin to test fire it and see if the clothed expansion is better or worse. From looking at the bullet, there is a spike in the center of the hp. This should help force the rubber outward making the bullet expand. Since the tip is filled, it can't get clogged. The hydrodynamics of the rubber will help with reliable expansion. At least that's my hypothesis. The OOMOO 30 costs $25 per quart. That should go along way for a lot less. Since it is poured into the cavity, the fit will be perfect. And rubber won't be affected by ambient temperature. In fact, once the bullet has been fired, the extreme heat will soften the rubber making it more viscous on impact. The weight will be negligible Any thoughts? .