Clean the beans removing any stones or foul beans. Rinse under cold water and drain. Bring enough water to cover the beans buy 1-2 inches to boil in an uncovered pressure cooker. Add the beans and remove the heat. Cover loosely and let stand 1 Hour.
Remove the beans to a colander and rinse under cold water. Discard the water in the pressure cooker andd back the beans and refill with enough water to cover beans by 2 inches. Add the bacon fat, chili powder, cumin and cayenne. Seal the cooker and bring up to pressure. Once at pressure cook the beans for 40 minutes.
Remove the beans from the pressure cooker to a large bowl or food processor. Mash or process the beans adding just enough of the liquid to achieve the desired consistency. Add the Chipotle peppers and process a few short bursts to combine well. Season to taste with salt.
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