Venison trimmings, whatever is not used for steaks or roasts, about 20% pork trimmings (pork fat) and one medium apple per pound of venison and pork combined. I run everything threw a coarse plate on my grinder, I like the texture better that the fine plate.
I have been trying to find out the ingredients in the seasoning mix I use for thirty years or more. It was originally developed by Woody Boyer after he came home from serving in the Marine Corps in WWII and started a general store. He no doubt mixed it up to use with the deer him and his buddies shot.
Here's a pic from back in the fifties of the front of the store with some of their deer. There was always a full service butcher there , smoke houses and all.
Anyhow, it's a well-guarded trade secret. I know there is coriander in it but the old butcher would never tell me what else or in what proportions. They finally fired him because he was a drunk and it was causing problems. The new butcher knew Woody, as did I, and I think I may be able to get him to reveal the secret ingredients. It might take me a few years but...
That is the only seasoning I've ever used in my sausage, it's what makes it so good.
Like I told the new butcher Saturday, if something happens to him and the secret lost, I'd be up the crick without a paddle!
You could try the venison, pork and apple ingredients with the seasoning of your choice. I'd recommend staying away from anything with sage in it though, there's none in the seasoning I use and I think that would ruin it.