Hi; I've been invited to a 1k yard shooting match this coming summer . I plan on using my Ruger Hawkeye SS in 6.5 Creedmoor. It is my hunting rifle and I don't have large amounts of money to put into building a target rifle. So far the rifle seems to be a 1/2" @ 100yard shooter. The stock is the factory synthetic. I have been thinking of putting a Stocky's laminate thumbhole on but I don't know how well it will work for shooting with a sling from prone. Aparantly bipods , rests are not allowed at this match .. Any advice will be appreciated.