Dave Russell
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They came out pretty well. Flavor was good but not anything to really write home about, and they were a little dried out. I pulled them when the probes were 195F or so thinking I'd be golden, but not so. I may try the foiling method or a lower temp next time..I cooked at 250.
I looked back at your post and see that you left the salt out. Yes, the recipe can be too salty with table salt, but it's perfectly fine if you'd used kosher, and the garlic salt wasn't enough on it's on. Injections are supposed to be too salty, since the liquid ends up all running out, thus not being a factor in helping with moisture. It's just to add flavor and baste from the inside out, so to speak.
Dry pork comes from not cooking long enough or too long, cooking too fast or too slow, or holding too long at too hot a temp. Cook to tenderness, and that could be at 185* or 200*. It just depends, but wherever you lay the blame of dry pork, the juiciest pork shoulders I've smoked were NOT foiled until holding after the cook, and that was for less than two hours or not at all. The driest pork butts I've ever pulled were cooked to tenderness and then held wrapped in a hot cooler for too long. (Of course, larger and more marbled butts end up more moist, as well.) As to cooking temps, I find that water in the pan seems to give more "forgiveness" in temp variation and spikes, but have had great pork cooked at around 250*, water or not. I use water for overnights, full cookers, or if windy.