Odds of flopping quads with PP are 407.2 to 1 or (0,25%) - in theory.
But it depends on table and your style of play - practically, you dont go with all the pocket pairs to flop
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I think that you (if you are DarrylBunson) should have bigger amount hands than I so try to filter your data in HEM (if you use it).
In HM - filters=>hand values=>hand value on flop=>four of kind with pocket pair
thx a lot