I was shooting yesterday at 400 yards with my .308 PSS using 168 vlds,it was blowing between 12 and 17 mph at 12 o'clock and i was only managing 4" groups,normally it would do half of that or so. What i wondered was will a straight on headwind affect group size much? I'm fairly new to this and just teaching myself and reading in places like this! Any help or opinions would be appreciated. Thank you.