I have always used a front bag when I was shooting a rifle off the bench. Today, I was at the range (shooting 6.5 CM) and started at the 500 yard steel. No problems hitting the steel (24" circles). Tired the 8" squares and hit about 60% of the time. A guy that was spotting for me said that I need to try shooting using a rear bag which I had but never used. After a couple shots using the rear bag, I was grouping on the bigger steel around .75 MOA. Ran out of rounds before I could get back to the 8" steel.
Those rear bags work.
Those rear bags work.