They'll swage themselves going down the bore.
Slug your barrel, and see what you're workin' with.
Bet your groove diameter is .3565 or more, making your gun a .357 anyway.
You're prolly gonna have to seat and crimp in different steps, worst case scenario, use a LEE carbide factory crimp die.
What kind of press are you using?
I'm not just a gun.
I'm YOUR gun.