The only thing limiting improvement in velocity and follow on development of bullets to fit the velocity is nay saying and those who thing the .30-40 is the bees knees.
Go for thee .25-06. It's already been done to a point.
There is one group with huge cases shooting 270 grain bullets over 4,000 fps. and upt over 400 grain bullets near that. Using H&R Handy Rifle actions and shells more akin to metallic shotgun shells. I'll try to retrieve a link unless someone beats me too it.
I see the problems with extreme performance, as short shell life, and bore errosion.
All the other stuff is juts details such as expensive to shoot.
Dyna Bore coat won't last forever and will have to be redone but the limited feed back indicates it works.
Then there is of bores and the use of expensive metals such as in the Stellite etc.
So lea the way. A solid .25 bullet at a bout 5,000 fps sounds good.
