Beeman silver sting .177 , 8 grain pellets , 1700 psi fill , no turns on power adjuster . One fill , two 25 shot strings , one 10 shot string .
String 1 - 791 , 778 , 781 , 778 , 783 , 784 , 784 , 793 , 793 , 796 , 797 , 793 , 804 , 803 , 801 , 804 , 812 , 811 , 805 , 815 , 822 , 819 , 828 , 829 , 826 , average 801 fps .
String 2 - 826 , 830 , 837 , 835 , 840 , 839 , 841 , 842 , 842 , 841 , 843 , 843 , 847 , 848 , 845 , 843 , 839 , 842 , 842 , 834 , 845 , 837 , 830 , 831 , 827 , average 839 fps .
String 3 - 829 , 828 , 825 , 816 , 818 , 810 , 809 , 804 , 800 , 794 , average 813 fps .
Average of 50 shots 820 fps. Average of 60 shots 819 fps . 7 percent deviation .
Discovery with stock spring cpl 7.9 pellets . Same fill rate . One 20 shot string .
981 , 978 , 975 , 972 , 970 , 966 , 965 , 960 , 956 , 953 , 946 , 949 , 923 , 935 , 929 , 923 , 921 , 914 , 908 , 903 , average 946 fps . Deviation 8 percent . Marvin
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