[e~shot]

4 strands 1842 ---> 6kg pull
4 strands 1745 ---> 8kg pull
4 strands 2047 ---> 10kg pull
4 strands 1949 ---> 12-13KG pull
4 strands 2052 ---> 15KG pull
8 strands 2040 ---> 12KG pull
8 strands 1842 ---> 16KG pull
8 strands 1745 ---> 18KG pull

I prefer 1745 can use for 12mm steel balls, also 1842

 

[e~shot]

Check this