Ok...I'm new to long distance rifle shooting.. I went out to 300-500 yards with a buddy.. He spotted for me and I followed his directions and adjusted my shots on the 500 yard rifle target... but when it was my turn to look thru the spotting scope... I was like---- um, I didn't see it hit? um I didn't see dirt tossed up...Um??? I think a tad to the right above the left shoulder?? I can tell he was getting frustrated with me spotting for him...basically he was wasting rounds!! cuz I couldn't get him on target!! HELP!! any tips? sites? books?