I am primarily a crow (varmint) hunter. I have used mostly .22 caliber pellet rifles and a 12 gauge shotgun on them. They are very tough to take out, I call them the "Armoured car of the bird world".
Back during the 1980's in Oregon, I used a Crosman 2200 pump up, with 10 pumps and a Crosman or Daisy brand flathead wadcutter pellet. When the crows were hit they were stunned, had a hole in their chest, but would fly away after a few minutes. Back then, Oregon was isolated in terms of things to buy, it was Daisy, Crosman, and cheap flathead pellets. Later, when I moved to Minnesota I bought a RWS model 52 springer, and used, if my memory is right, Beeman hollowpoints? The hitting power was more dramatic, but I still had to walk down to the place where the crow was hit, as they were still alive, but stunned and could not fly, and finish them off with other means. The only time that rifle did the job cleanly, was inside of 20', the crow was killed immediately. Needless to say, I sold off the RWS as I was disapointed that an expensive gun like that could not humanely kill a crow inside of 60 yards.
Now that I have a Benjamin pump up 392 in .22, and might get another springer, what pellet is the best on crows? I can say with only a few days of ownership that the Benjmain has been very distructive on house sparrows, with only 3 pumps. But, house sparrows don't take much to drop.
Thanks.