The most blue engrams I've even gotten from one ROC strike is 5-6, from completion and picking up engrams throughout the strike, and I've done 410 strikes and I'd guess at least 350 of them have been ROC, so I'm pretty sure you don't get 10 engrams per strike
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With 2 blues after completion I did get a total of 10 one time. I know it doesn't happen often but I figure Id put the low and the high range in.
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Im lucky to get 2-3 ...