Adjustments system diedon a 300 win mag - Vortex Crossfire II 3-9x40mm 1in Tube Second Focal Plane Rifle Scope

I put this on a Browning BLR in 300 Winchester Magnum. A few shots into zeroing the adjustment system died. I took it off and tossed it in a box because the trouble and expense of sending it in for repair or replacement wasn't worth it considering the cheap price I paid for the scope. And, if I got a replacement, how long would that one last under 300 Win Mag recoil? These might be good scopes for a rimfire or low recoiling centerfire. Regardless, the one I have is toast.