I like using shooting sticks and taught my son to use them when he was 11 on his first trip to Africa.He used them this year to take a 197 yard pronghorn 40 miles outside of Casper, Wyoming. I use the sticks from Long Grass
http://www.long-grass.com/shootsticks.htm. They are a bit spendy but very well made. It take a while to get used to them but I don't hunt without them now.