Re: 300 Win. vs 300 WSM
The short magnums' cases after firing are hotter, even too hot to handle.
But the .300 WM's are cooler, and you can touch them after firing.
One would think that that would be a clue for longer case life for the cooler ones.
So, the question is: What are you after?
A more efficient load?, or a more efficient case life?
I have a .300 WM (Ruger M77 LH with a Timney trigger), and it shoots almost half-inch groups.
It even shot a 7/8" group at 300 yards.
My Dad's .270 WSM (Browning auto) can shoot, but you have to let the cases cool off before picking them up...
One case landed on a plastic sandwich bag on the bench, melted and stuck to it!