I've epoxied two studs on, one with JB Weld and the other with Superweld, both are still on but I must say I haven't shot one of them much tho, the 6.5x55, so can't say it's been well tested, but the other is my 35 Remington, I carried it hunting one year, not much by sling tho, don't use em much, but it's been to the range a few times since, still holding up.
FWIW, I've epoxied dozens of shims in and never had one let loose, metal prep is mandatory when bonding metal, not only do the surfaces have to be degreased, but they need to be textured or roughed up to give the epoxy lots of micro surfaces to adhere to, course sand paper works well, then the epoxy must be rubbed into all those tiny scratches, a popsicle sticks works extremely well.
Tim