On it's face perhaps, The back story to this is originally years ago, I had a piece of rubber paver behind that notch when I picked off a few tree rats. None ever exited the body cavity. Now, the setting was at about 20 FPE with a large 25 cal polymag. Which would penetrate less then an equal powered 22 cal. I've made that shot at a still target, because it's busy eating peanuts, they give you a perfect chip shot. Fact is distance is real short, and polys never exit a squirrel at my listed power. Now, I'd NEVER try it with a bird! they are through and through. I totally respect the target and whats behind rule. This is an area where I can't eff up. But I am aware what I can get away with- regarding specific ammo and power.