Always wanted a 5mm as a kid, later in life, p/u an R9.......never disappointed. A thumper with 14.3 Premiers.

Yes, the original pellets were solid and penetrated great, pros/cons depending on application. Newer pellets improve the versatility.

Now slingshots (mostly a "Pocket Rocket")......I can tell you guys some stories! Heavy lead projectiles accounted for many DRT squirrels. Steel Ball bearings and marbles took care of various feathered varmints.

And a Feaux S&W 41 - aka Daisy 790G, tweaked with a little extra "Rod" to add power, that little thing was a tree squirrels worst nightmare....