They should work out of my 22" barrel then. With the extra 8" I'd guess 2300 fps.
Maybe 2100fps.. Shoot for bones and the Speer will work fine. I wouldn't expect much expansion.
http://www.ballisticsbytheinch.com/357mag.htmlI've never seen 2300fps with any 180gr bullet in the Maxi and I have loaded it to the gills with the assistance of Johan Loubser back when he worked for Western Powders.
https://www.linkedin.com/in/johan-loubser-68656542