I have used a Hollywood single stage press for years. I have several presses now but find myself going back to it all the time. I have loaded my match ammo on it in the past when it was necessary with no problems . Great press.
This may seem obvious, but watch those bolt lugs for galling . Sometimes the chamber is tight and you can have problems with factory ammo. I mention this because I have experienced it. Good luck , the 25-06 A.I. is one of my favorites.
A savage 340 is a great little rifle. It sounds like you are planning on building a custom rifle using your grandpas rifle, but when you are finished you will have a new rifle with grandpa's action. Now to answer your questions. A custom stock can be built for just about anything,for a price...
I have a 16 inch 450 with carbine stock. The recoil with factory 250 grain loads seems comparable to my M1a scout with 150 grain loads. The 450 really hammers the hogs.:D Hope this helps.