I own an Elite 3200 1.5x-4.5x-32mm with the Firefly reticle on my .375H&H Mag and it has held up perectly!  In fact, it tracks and holds zero fantastically.  Would you believe 3 shots groups at 100 yards under 1/4 inch?!?!?!? :eek: 
I don't know about the Trophy on the .375, but the Trophy handgun line holds up well on the big bore handguns like .480 Ruger and .454 Casull.  Still, for a little extra money, I'd get the Elite 3200.  I bought mine from theopticzone and it was about $200 or under.  Check and find out!
Zachary