Went to the range today with new F1 master chrony. shot some starting loads of 525 grain pile drivers in .457 WW Mag cases, cci 200 primers and 40 grains of reloader 7. I'm shooting a Wild West Guide Gun. chrony read 1517,1530,1529,1513,1523. recoil mild. I did not expect numbers this high because I'm 4.3 grains under max load on BT site. This was the first time I've used a chrongraph. Can these numbers be trusted?