I had some custom bullets made by Hawk. The bullets are 250gr .025 jackets and double annealed. Bullets on the left are unmodified. I added a 1/16 hollow point to the bullets on the right. Weight was reduced by 1.8 grains. I added some pics of the bullet tip. I think I'm on the right track. My next order will be a slightly longer jacket and what I consider a compound hollow point. It all depends on the expansion to penetration ratio. Hawk does not hollow point but, they are very accommodating. What is interesting is their comment that they make .510 cal bullets that are designed for expansion at subsonic velocities all the time. So either you guys are holding out or the military has some cool toys.