Hi deeangeo, I have been following this with much interest. Did you manage to source any .267 projectiles yet. I await that trial and outcome with much interest. When I was younger we had a .303 that had little real rifling to see and would keyhole badly so we tried an 8mm projectile in a fired case and it fell in. We then loaded a couple and shot them and they grouped well enough. So this gave it a new lease of life, maybe not recommended but it worked and we shot it for many more years as a knock about pig gun like this.
Anyway I hope you have success in Scotland.

Regards

Steve