Some brake end caps reduce recoil notably. The extent depends on design, how much powder you're burning, and muzzle pressure. Take a look at TBAC's recoil reduction figures on their suppressor lineup for illustration (and the RR aren't even the most effective compared to some aftermarket designs) -
https://thunderbeastarms.com/img/Poster_2024_magnus.png
With a 300 PRC a good end cap brake should make a noticeable difference but it's going to make the gun louder. OP is kind of asking for a unicorn. Small can on a larger magnum = mediocre suppression and recoil mitigation.
The one that is most appealing to me in theory for OP's application is the SAW Orev with the end cap brake. The down side would be OP's application is maximizing the rating of the suppressor and there isn't a lot of first hand use reports to say if that rating is conservative or not. 2nd choice would be Nomad XC with recoil x comp brake end cap but that is going to exceed desired weight/length a bit more.