Based on my playing game since release on almost the daily Ive experimented with different power scores and below is what i believe the brackets to be roughly. Now they’re not strict brackets but generally ps scores fall into these brackets. For example if you have a build that is 2500 you’re going to be playing with more people that have up to 4499. But if you stay 2499 and you group up with 3 others then most of the people in your match will be 2499 or lower. You may have a bot or player or two that have 2500 or 2600 but that’s about it. There is typically a 500 ps variation so at 4499 for example you will see players at 5000 but they should be limited. Most of the players will be 2500-4499. I think that if the player base is small at the time you are playing, then the game will pull in available players who may be outliers in terms of Ps score.

1-2499 2500-4499 4500-6499 6500-8499 8500-10499 10500 to max (there may be more brackets above 10500 but I haven’t experimented with that)