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I started making fresh sausages about 6 years ago and I learned that if I made the sausage links a little squishy they would grill and plump up without busting. That was my solution for fresh links.
Now that I have just started smoking sausage I find that the appearance of squishy smoked sausage links isn't very appealing BUT I did find that when you grill these smoked fully cooked squishy looking sausages they STILL plump up and look just fine.
I guess in the future I will be making tight links for fully smoked sausage. Maybe I'll do a 50/50 tight links to squishy links and see what I can learn and then go from there. I won't do this until about November of this year when my hunting is all done and I have the wild game meat to make my sausages.