how do you guys handle orks ?

Title really !

my mate plays orks, and does pretty well with them. I played him with my nids/tau/DA with varying degrees of success, but never with my DG.

How do you handle the waaaaagh turn ( or double turn with bully boys ) ?

I usually try to screen/delay his advance and try to murder as much as i can from range, but with DG being such a midfield brawler i'm not sure how they'll do !

any advice welcomed ! cheers