RE: Strongest Action.
I'm glad that the P-17 Enfield was mentioned. I have read several good articles about the strength of this action. I owned one in 30-06 at one time, now I have one that was re-barreled for 300 WM and I have one that is all original (30-06). The problem with the 30-06 is that the barrel is comepletely rust pitted. I had it given to me because it is "un-shootable."
I have dreams of having a custom rifle made from this action. Just not sure which caliber. I have a .308, and 300 WM, so maybe a .338?