As per my previous post, there is no safe solution in .22LR for ricochet prevention.
I have tested all different bullet construction in wet pack paper and firing directly down into a 200-liter drum filled with water in an effort to push projectiles to their limits and get them to over expand, and there is minimal difference in performance in terms of expansion. The only expectation to that was some old RWS that I had which did perform like a jacketed projectile, and I put it down to a softer lead.
I have a Waltz tool and can hollow point my own ammo and have put super-size hollow points into projectiles in an effort to get them to disintegrate in a rabbit. Again, minimal difference.
Safest rimfire solution is the .17HMR or .17HM2 and don't miss your target. Fast light projectiles = disintegration.
PCP .22 - stick to pellets over slugs, which will limit your range due to their BC, but as per @flock the PCP's accuracy will outshoot a .22LR every time. Pellets lose their energy very fast, so misses are less likely to cause down range damage.
PCP .177 - this is another option. Way less energy than the PCP .22, but the accuracy lets you go for head shots. I haven't seen any in NZ yet, but they are now producing .177 slugs in South Africa.
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