I have my cz 457 in an ACC chassis, for CRPS I would recommend the ACC, you will be able to add weights at the front and back, not for recoil management but for balance of the rifle on props.
I have a XRS on a tikka T3, it is ok, but more limited for options later.
If you get the ACC, make sure you also get the magazine latch extension.
My setup for CRPS is 16 lbs, and it balances 3 inches in front of the mag well.
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