If you are happy to single feed, a real easy solution could be to just increase the throat length on your rifle while keeping it as a 7mm mag. Seat the projectiles way out, which will free up case capacity for more powder resulting in a bit of an increase in performance without expensive brass & without burning disproportionately more powder.
Once that barrel is toast and you have some practice under your belt then put together something that is a bit more niche. (specialty cartridge, faster twist /longer barrel)
I recently got a long throated 7mm mag put together. It got up to 309x fps without pressure signs shooting the 180ELDMs. It would have gone higher but that's where my ladder test that i'd loaded up stopped so have no data past that. It does have a 30inch long barrel though.
Just something to consider.
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