I bought a vacuum sealed 10 kilo USDA choice sirloin from costco. I want to slow roast it at under 300F. How long? Should I sear it?

You bought a 22 pound sirloin roast?

At 325 degrees it's 25 minutes a pound for rare. I'd go from there. And I wouldn't sear it, not if it's a good piece of meat.

My slow cooker won't handle anything that big - or are you talking about slow cooking in an oven?

If so, rare, medium, well - ?

Can your oven comfortably fit that amount of roast in one go.

While 25 minutes per pound will be rare, there's a good chance the centre of the piece won't even get warm, let alone cooked..

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Originally Posted by Curlyben

Can your oven comfortably fit that amount of roast in one go.

While 25 mins per pound will be rare, there's a good chance the centre of the piece wont even get warm, let alone cooked..

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If guesses count I'm guessing it's rolled as opposed to lugging home a quarter of a cow. But, again, it's only a guess.

A meat thermometer - in either case - is probably a wise investment.