Bret4207
At the casting bench in the sky. RIP Bret.
The 350 Legend is loaded with a .355 bullet. Why Winchester did this is not completely understood.
Randie
Fort Smith, AR
What you use with jacketed isn't always going to work with cast, especially as you up the speeds. Regardless of what they say the bore is, I'd figure on more than .355 for sure. Start by measuring a case mouth ID that's been fired with a full load. There will be a little spring back, but it will give you place to start. Slugging the barrel is even better. Aim for +.001 over groove diameter to start with and see how they chamber.