Have read as much misunderstanding of basic ballistics on this thread as on any subject that's appeared on this forum in recent years.
1) The 7mm Weatherby case has just about exactly the same powder capacity as the 7mm Remington Magnum, but the longer throat of the Weatherby does allow around 150-200 fps more muzzle velocity at the same pressure.
2) Yes, a 1-10 twist will stabilize some pretty heavy 7mm spitzers, but not all. If you don't get this, then you need to do some remedial research on rifling twist.
3) Once again, most posters are obsessing about muzzle velocity, when what really matters is downrange velocity.
4) Whether any of this matters in the so-called "real world" (sometimes I wonder if that exists on the Campfire) is another question,
