Maybe he loves pain? I just noticed the OP said its his "first rifle".
300 winmag... without the proper training, it wont matter what scope you get... you won't be hitting much with any real precision. :P
...Slow, deep breath in followed by two quick, shallow exhales, then one long breath out. It should sound like "HEE HEE HOOOOOOOOooooooo...HEE HEE HOOOOOOOOooooooo". Once your comfortable with that breathing pattern, try to sync the tempo up with your heart rate. "Lub-dub...HEE HEE HOOOOOOOOooooooo... etc". ~ CBruce