Sounds like an AWESOME idea! You don't have anything to loose do ya? For a few hundred bucks you'd have a "new" rifle in a familiar gun in a great 0-200 yard deer thumper. Im with 007FJ though and would try out the 338 federal. My Montana chambered in 338 fed is my go to hunting rig. Shot two deer with it last week and it just put em down like a light switch went off. The 358 and 338 fed are pretty similar and you wouldn't go wrong either way. I say go for it and don't second guess yourself!
Corky
