I need to measure the throat in my 70 and see how long it is actually.
Those 450’s sound quite darned powerful.
Standard 458 Win Mag chamber will be plenty Big B, i had a rube goldberg parts gun in 375 AI built up on an old model 70 action i torched the throat on in 7mm STW, pulled the AI barrel, had a spare barrel in 375 H&H, had 'smith install that one and sent it to JES for the 458 Win Mag rebore-rechamber, a 458 WM built on a 375 H&H length action is a whole house of hell waiting to be unleashed.
