Stan,
What you’re looking for is a Texas Hot link recipe. You can put whatever you like in terms of meat bill but most are 50-75% beef with pork as the balance. Walton’s sells a hot link seasoning mix and a typical 32-35 hog casing is fine.

Here’s a link to another recipe I’ll be trying soon as it looks pretty solid.

http://www.rimfirecentral.com/forums/showthread.php?t=236256