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I have been smoking a 12 lb brisket for 6.25 hours at 225 to 260. Internal temp 201 and thermapen mk4 slides in like butter. I was expecting 10-12 hrs. Going to wrap in foil and towels and transfer to cooler.
Sometimes the BBQ gods favor you; every piece of meat is different. I'd consider myself lucky.
I had a 10 lb. one come in once at 8 hours, and kept wondering what I did wrong. Only bad thing about it, was that it screwed up the timing on my dinner.
The one before this was 10 lbs and took right at 10 hours. I use the Thermworks Smoke duel probe & Thermapen. But even with all this technology, and the probe sliding in with no resistance. I was still reluctant to pull after 6.5.