Looking for pretty much all parts necessary to make my short action 12 a short action magnum.
magnum push feed bolt head (savage or PTG), front baffle, correct firing pin assembly, WSM/Saum mag box and follower
PTG has the bolt faces in stock. I just ordered one a couple hours ago for a new SAUM build. I used the same firing pin assembly, just re-timed it, on my 7 SAUM and it worked fine. Accurate-mag makes decently priced AICS style WSM mags that work with SAUM as well.
They do make some factory magazines in WSM but they feed like a standard savage magazine, not that great.
With the PTG bolt face the magnum is the same dimensions as the .473 (except being .550 instead of .480 diameter). So the baffle that was on the existing bolt worked.
Being a hunting rifle you might want to go ahead and upgrade the firing pin. Mine is just a target gun, so if the firing pin sleeve gets damaged I will fix it at that point. Would suck to have to do a follow up shot and find out it got damaged at that point.