7 saum

I have a short action with the mag bolt face and standard bolt face. Currently not using the magnum bolt for anything but want to get into a 7 saum
Well if you don’t want to buy another action then the short will work, 180s are pushing so personally I’d stick to 168s or that range of bullets. If you wanna run 180 or heavier I’d get yourself a long action if it were me.
 
180gr ELD-M loaded to 2.95 with a milled feed ramp in my Bat VR work very well.

If you already have the action and stock I would be tempted to stick with what you have got or stick with the barrel you have on that rifle and buy a second rifle. Always nice to have more than one in the safe.