have four (and I love them) of the original Keltec P-40's in .40 S&W (since discontinued because of recoil). I used to get out my .44 Mag 4" full power rounds to warm up for the Keltec recoil The real problem is not the recoil but the backstrap is a little squared off so you get the recoil impulse straight into your knuckle bones. I have tried several recoil mitigation strategies including bicycle inner tubes around the grip. But, alas, they have been relegated to the collection.