BudsGunShop.com - 357 sig

No, They definitely will not. 357 magnum and 357 sig are two completely different rounds. Hope this helps.

No, 357 sig will not even fit into a 357 mag. 357 sig is a round typically used in autoloaders and fires a similar projectile at similar velocities, but the cartridge design is completely different. The only other ammo a .357 mag will take (with some exceptions) is .38 special. This is because .38 special is the same diameter just slightly shorter and less powerful. I hope this helps.

Buds is out of 357 Magnum ammo right now.
In stock here though
ammobuy.com/ammo/357-mag

No this is designed for semi-auto handguns like the Glock 31, glock 32, or glock 33. It is used by state police all over the USA, it is designed to be harder hitting with better barrier penetration , and is basically 40sw case necked down to a 9mm projectile, so you get a larger powder load and a smaller bullet which equates to a much faster bullet.
But it will not fit in a 357 magnum.

Robert, no Sir. This is an entirely different Semi-Auto load from a 357 Magnum and is not interchangeable. Visual difference here : quora.com/What-is-the-difference-between-a-357-and-a-357-magnum

Yes they will Robert