Rick, I am too! lol....I can't figure it out.
Ok so I already had my deer ground up and stored....the fat from the supermarket is pork butt scraps. When I got it, I partially froze it, then ground just the fat and placed it in those ground meat storage bags. When I dethawed it partially, it wouldn't break up like the ground meat. SO, now what I do is take the partially frozen ground deer, cut it into chunks...then I take the almost completely frozen fat and cut it into chunks and grind them together in a coarse grind. Then I lightly mix. At this point the meat is still very very cold. My spices are already mixed with water, so I pour them over the mixture and mix it in well. Meat is still very cold, though not frozen, and I put into my vertical stuffer and stuff. Any extra that won't fit in the stuffer (larger batches) goes in the freezer to keep cold.
I'm using 70% deer to 30% complete fat (no pork in with it). Maybe this is the problem?
next if I use bactoferm (I have LHP), I ferment at the recommended 8-12 hrs at 95 degrees in the oven with just the light on.
when done fermenting, I usually have to wipe the casings dry if natural casings were used because I have some slight fat leakage, then I place them into a 125 deg. smoker for 1 - 1 1/2 hrs bumping up to 130 during the middle, then I bump up to 140 and add smoke for a few hours, bumping up to 145 then 150 in between, then smoke for a few more, bumping to 155 then 160, last night at this point my temp was around 115 I think, then I bumped to 170 and held....it got to around 135 or so....at this point, I had the sausages in there for about 11 hours, I tested my smoker and it was 5-7 degrees off on the temp. display so I bumped it up to 175 and then 180 over an hour. The temp started to climb again. I might have went too high on this last part but it seemed like it was taking way too long for the 25-27mm sheep casings....suprisingly, I didn't loose much fat...most rendered earlier.
I'm going to do some more summer sausage today and will get a pic of everything during the process for you...also gonna try using some unground pork fat that I have