A match setup where everyone used the same rifles would be cool. In this case all Rem Ultimates or even UF Ultimates or Coopers.
No projectile restrictions but all powder load data must be supported in the manual. In other words if BH209 isn't listed or limited to 120gr you can not use it or use more.
It would be interesting to see how many chose to use conicals over sabots and how well they compared.