If you had deer run off, no blood, no exit wound, then you had terminal impact (i.e. bullet choice) and/or shot placement issues.I've used a 6.5x47 with 3 different bullets this year on 7 deer. Havn't been satisfied with any, all the deer run off with no blood and not one exit. 11 deer over the last few years with my 7-08 and 162 amax has resulted in 1 deer running off and pass throughs on every one.