Rifles Only, a Marksmanship/Sniper/Tactical training center is offering in conjunction with Snipers Hide and online training program for $10.
They have PDF file formats and videos. It has been said to be one of the best deals in training ever given. Practically a steal.
Go to Snipers Hide to find out.
For instance in the first lesson, you learn about your cheekweld, a "press check" for rounds chambered to ensure a bullet is picked-up off a magazine, loading up the bipod by putting forward pressure on it.
Just a small example of the little nuiances that it takes to be consistent.