When I started deer hunting I heard a lot of theories on why venison is sometimes gamey. After 45 years of experimentation, I can only guess, since I never had any of mine that was gamey but I have tasted venison from other sources that was. I tested every theory and the only one I have left is how the meat is handled. How quickly it's gutted, how quickly it's cooled etc. I have left scent glands on and cut them off. I have skinned them immediately and left the skin on for two weeks. I've had old, young, corn fed, grass fed etc. They all tasted great. The fat on the corn fed ones is always a bit strong, but if you cut the fat off, it's fine. I'm kind of like Francis Bacon who said when he was young he had five theories on how to rear children. Now he had five children and no more theories...