Hm. I couldn't find the pressure rating of the SOCOM with a quick search. The larger diameter of the SOCOM case means the case head thrust against the bolt would be proportionally higher, a=pi*r^2
Some Ishapore Enfields were proofed for 7.62x51, which is way on up there. And the Gibbs .45-70s shoot "modern" high pressure .45-70.
Find a CUP or PSI figure for the SOCOM and I can give you a better answer.
HOWEVER, looking at how the cuts inside an SMLE receiver guide the cartridge from the magazine to the breech, I'm still astonished that the .308 guns don't stovepipe cartridges. It would be worth trying to compare a .308 Enfield with a .303 to see if the receiver cuts were different; you might want to start with a .308 rifle if they are.
Even if you're set up for SOCOM, it's hard to beat a chambered and threaded .45-70 barrel for $85, though.