heres the list of standards...............................鈥?br>
international-metric wt.-grain - speed
1 ------------- 48 ---- 75 - slow, for use in highland
2 ------------- 49 ---- 76 - medium slow, for use in hotter area
3 ------------- 50 ---- 77 - medium, most sea level area
4 ------------- 51 ---- 78 - medium fast, cold area
5 ------------- 52 ---- 79 - fast, cold area, below sea level
From the list, you can see that the shuttles were traditionally divided into 48, 49, 50, 51, 52 according to the weight of the shuttles. 49 weights 4.9g, 50 means 5.0g, 51 means 5.1g and so on
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