I don't think you'll find anyone that would chamber a barrel for you; too much liability. Even if you cross your heart and promise to download it, there's always the chance someone will get hold of it and hurt themselves, ending in a lawyers wet dream.
There a several .25 and 6.5 wildcats based on .30/30 or .225 brass that are pretty impressive. The 7-30 Waters can also do well with pointy projectiles.
