The 7 WSM will exceed the velocities of the 7 rem mag
with 120&140gr bullets.
And in these bullet weights have better ballistics
than 30 cal bullets.
The bolt face will have to be opened up and the
rails will also have to be opened.
The Magazine may not hold but 2 rounds (the big
case does not like the staggered follower but 3
rounds should be enough.
Look at the ballistics of the 7 WSM as compaired
to the 300 WSM
with lighter bullets and you will
probably reach the same conclusion.
Good luck on your project
Hope this helps
J E CUSTOM