Hunting for Pellets: Handheld Metal Detectors for Game Birds?

Looking at getting one of the small hand held metal detectors to try to find shotgun pellets in my pheasants, grouse, etc... I found 2 online and don't know anyone who has used these before, so I don't know if they work, for starters, or if one is better than the other. Huge cost difference between the two. Pinpoint handheld metal detector $20 Garrett Pro $130 I eat quite a few birds every year, and I end up biting a pellet every now and then, even though I run the pieces over a mag light (like an x-ray) to find most of the pellets Anyone have experience with these types of detectors and finding shotgun pellets? I'm 49 and I don't need another crown