Thanks guys.
Mark:
I usually take broadside shots because that's all I can take most of the time. They fly in from either the left or right direction and that's where they are facing when they land on the bowl or inside it. They almost never face me (towards the house). If anything they may face away from me (the woods/trees for easy escape to the trees), so I have shot them in the back too

I prefer frontal shots but I 'll get them anyway I can. At 20yds I am confident I can hit them every time so I don't worry about them going anywhere after being hit. Broadside shots also destroy their wings so they can't fly. In many of my pics you may see a wing that looks broken or sticks out. Even if they don't die from that, they are stunned for a few seconds and don't walk or run right away like other birds. That gives me time to pull the bolt & reload (fast - since the 850 is multi-shot) and I may take another shot, if I see them get on their feet or are still alive 5-10secs later. I had to do it once or twice, but the .22 pellet goes through them no matter where I shoot them. I don't think I have ever lost a Starling after hitting it. Last year one circled around over my head after being hit. I was outside shooting off-hand so I must 've been off a little. That's when they were not afraid of me as much

Anyway it would lose altitute with every circle. After circling 6-7 times it landed just a few feet away from me. I actually had to move out of the way because I didn't want it landing on me, hehe. It expired a few secs later. I am trying to recall a time I have lost one but can't. I took a couple with my Diana 36 .177 too and they died instantly.
I have however lost a couple of Grackles after I hit them. They are much tougher birds and know what to do when they get hit and can't fly. They run into my neighbor's bushes right away or get inside a thorny bush. That's to be expected though.. "lose" a bird here and there. They 're dead anyway. They 'll be lunch for a cat or some night predator. They can't escape a skunk sniffing around..
One out 15-20 Grackles is odds I can live with, but so far I 've had pretty good luck with Starlings. They are more fragile than Grackles (or Black birds). The smaller they are, they faster they go down.