I am planning to have a rifle rebarreled to .358 Winchester. I want to shoot 225g and 250g bullets. What is a good twist rate for them?

1 in 12 would work for everything you want to shoot.

For cup & core 225 & 250s a 16 twist is just fine. Copper solids, depending on shape, may or may not be too long for a 1:16.

Berger has a twist calculator on their site.

https://bergerbullets.com/twist-rate-calculator/

Thanks

Would go with a 12- 14 you cannot over twist

right on. the 1-16 would limit your bullet selection

Thanks again

1 in 12