I have shot both my xls through the chrony several times and seems theres and mine are different numbers the xl1100 which Ed(454 big block) now owns was shooting a average of around 925 with cphp and the xl1500 it was way more than they are getting with rws hollow points around 1275 fps and crossman ultra mags at 1075 fps makes me wonder if maybe my chrony is wrong?? But needless to say they are both very hard hitters and fine shooters for some who has the patience to master for sure not a ag for the newbi. Thanks David