We did a run for this cartridge in 2020 for Omega Rifles. We do have over-runs available for purchase:
https://leeprecision.com/2-die-set-375-raptor.html
We do have the factory crimp die available for immediate shipment as a custom over-run, please select 375 Raptor from the dropdown list:
https://leeprecision.com/custom-rifle-factory-crimp-die-thread.html