I've lost very few squirrels too, but they've all been with roundnosed bullets.
I've tried for years to incorporate rifles and shotguns into my routines, but have continually found them to cause more problems than they solve. I prefer to hunt by silently navigating through animal habitats against the wind rather than waiting in some stand hoping game magically walks out in front of me. I have significantly more success this way. Because shot opportunities in the forest are generally less than 20 yards for small game and 60 yards for larger game, and because moving silently through the forest is very physically challenging like ballet and requires the constant use of all four limbs, handguns just make more sense to me, and I have far more success using them. Most people view handgun hunting as a special challenge, but in my experience it is far more challenging to shoot animals with rifles because carrying something that large and heavy changes my body mechanics in a way that makes it extremely difficult to move gracefully enough to get within sight of animals without spooking them. I also don't know how people can shoot animals while wearing any kind of footwear sold in sporting goods stores, I would sooner just go barefoot.