I just think you'll be over done at those temps....
Personally, its easier to do the high temps 1st and get it perfect...
If its at 125 and then you cook it on 500 for another 20, that seems a bit too much to me....
But you know your own kitchen more than me...I do mine at 500 then lower to 325 and they come out so perfectly.... I used to make them the other way until a butcher told me the fool proof way...take it out at like 115 ...rest it, and it raises to 125
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