Shreyasi bagged a silver in women's double trap to give India their eighth medal from shooting, before Asab made it nine by finishing on the podium following a tense shoot-off for the bronze.
For both shooters, it was their first Commonwealth Games medal, with Asab winning it in his maiden appearance. For Delhi girl Shreyasi, she made up for the disappointment of failing to win anything in front of her home crowd fours years ago at the Games in the Indian capital.
Another Englishwoman Rachel Parish won the bronze with 91 points, after a shoot-off with Cynthia Meyer of Canada.
A not-so-impressive first round of 22 points saw Shreyasi trailing at the third spot after the third and penultimate round but the Delhi shooter recovered some lost ground in the final round to taste success at the Barry Buddon Centre.
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With Kerwood, in whose name the Commonwealth Games record of 106 points (at 2006 Melbourne) stands, struggling in the final round, Shreyasi was in with a chance to go for a shoot-off for the gold but missed the double target twice to settle for the white metal. Shreyasi had rounds of 22 24 23 23.
The other Indian in the fray, 20-year-old Varsha Varman finished fifth with 88 points (22, 19, 24, 23).