Paco Kelly makes, or used to make, a die to reshape the points of .22 LR ammo that a lot of folks seem to think increases the killing power compared to the average 40 grain RN bullets.

I think that Marshall Stanton may have written up a tool that he made from an old .22 barrel that allowed a person to file the end off a 40 grain RN .22 LR bullet, giving it a wide, flat, meplat that was claimed to make the reshaped bullet more deadly than the original.

If given a choice, I'd prefer to shoot tree squirrels with the 17HM2 than with a .22 S/L/LR.