A little back ground, for the first time this weekend I was able to see consistant traces while my friend was shooting my 270 WSM and being able to see the trace was very helpfull in seeing how the air was moving. We were shooting across a draw that had a slow slope on one end and was steep on the target end and we had a 5 MPH wind shoot a 110v max at 3200 FPS for fire forming, range was 756 yrds. I cranked on a couple moa for wind and it was way of so I threw on 3.5 more for 5.5 moa and we started spanking the target, I suspected a stronger wind coming down the deeper part of the far draw. But after a few shots I was able to see the traces and I could see the bullet tracking out to the left with only a slight curve till about 2/3 rds out then it curved in hard right over the deepest part of the draw confiming that there was a faster air flow out around 4-500 yrds. I would really like to shoot a couple spots to check wind dope for hunting but it would be really like to see the traces because I suspect that they have a heavier spot of air flow. What seems to be the trick to first making traces or vapor trails and then seeing them consistantly?