I'm not sure why but I am seriously considering doing a build on a M 70 action. Been cruizing around and while I'm not finding new actions I do find some old juner Mod 70's for sale at prices that make them attractive. Question, to build a 300 Rum, .264 WM, or 7mm STW/Rum I know a need a long action but will a 30-06 M 70 action do or do I need to look for specifically one chambered in a magnum caliber already to ensure enough length and proper bolt face? I see a lot of older model 30-06's and .270's under 500.00 and to me providing they aren't worn smoot out seems like a reasonable way to get started. I'm a shooter not a builder so some of ya'll that are chime in please.