This is limited by not having the correct cartridges and not knowing what propellants are being used, but the answer to "will it be harder on suppressors" might not be quite so clear cut, based on GRT...
7mm Rem Mag (similar capacity to 7PRC), 175gr ELD-X, 24" barrel @ 62,000psi using H1000/AR2217: muzzle velocity 2940fps, muzzle pressure: 17,101psi
280 (similar capacity to 7BC, I think), 175gr ELD-X, 20" barrel @ 80,000psi using Reloder 26 (which I heard Federal bought up all they could get their hands on before Alliant sidelined the civilian market), muzzle velocity: 2941, muzzle pressure: 17619psi
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