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Not really. Doing the math, Q+R combo at that level only does about 730 damage. That's including Gragas' 128 AP. Dragon has 30 MR, which is gonna be reduced down to something like 5 with sorc boots and the appropriate runes. That means that Gragas' damage to dragon is at around 700. A level 11 jungler's smit is 790 alone. The only reason you got that was because the jungler didn't smite properly.