I almost always use Smithfield Prime Reserve from Sam's, and did this past time. I have been considering switching to whatever Costco has (I believe most times I've looked it has been Swift) because I am starting to feel like the money muscle on the ones from Sam's are too small, even on a larger butt (8lb+). I think for this next test I will use them again just so that I only change one variable. Tons of people surely use the butts from Sam's so I would think that if it was the meat/brand someone else would've noticed.