After trying a multitude of field shooting aids I settled on using shooting cross sticks. None of the commercial cross sticks I tried were not stiff enough, too much flex and not long enough. So I designed my own - 1/2" diameter solid aluminum rod, ground to a point on one end and covered with 12" of 1/2" heater hose on the other end. The two sticks are bound together with two wraps of 1" velcro. My sticks are cut to 44" in total length to accommodate me in the sitting position as explained below.
Advantages to cross sticks are I can quickly adjust the height by the amount spread on the sticks. If more adjustment is needed, I simply move the velcro ring up or down. While stalking, I can be on target in about 30 seconds, I don't have to fumble with trying to adjust the legs, etc. The cross sticks (w/ the rubber heater hose) also stabilize the rifle from twisting or jumping under recoil.
To improve my performance I shoot in the sitting position from a folding, light weight, portable sportsman's chair. Both elbows are resting on my knees, two feet flat on the ground - this gives me four points of support. The non trigger hand is wrapped around the sticks with the index finger wrapped over the top of the stock thus creating a solid "locked in" hold.
This system give me a relatively stable platform and provides a greater field of view when hunting, especially varmints and predator. I carry the light weight chair in the field on a sling. It can be quickly put into service by merely unfolding it.
I've obtained the best results with the rifle slightly forward about 2 -3" from the recoil lug area on the sticks. That way the support arm is not too far forward which can lessen stability. I apply a slight pressure to the sticks with the non shooting hand locking the rifle into the shoulder. After that - all the fundamentals of accurate shooting apply, focus on the reticle, breath control, trigger squeeze, follow through, etc. The key is to be consistent from shot to shot with your hold.
It takes some practice to become proficient especially on varmint / predator size targets. All my range time is spent shooting off the sticks. The only time I use a bench is for load development and initial scope sight in - I do get a lot of weird stares at the range

. On a good day, I can shoot about 1 moa out to about 275 yards or so.
I've been using this system for about 20 years now - I've taken 1,848 ground hogs, six deer, several foxes and a few coyotes with this system.
For beginners I recommend using about 6 to 9X power setting on the scope thus minimizing the appearance of reticle movement so you can concentrate on mastering the technique without jerking the trigger. Start at 100 yards and once you become proficient move to 200 yards - proficient defined as the ability to hit the vitals of the animal you will be hunting about 90% of the time. I use a 3 x 5 card to simulate the approximate vital area of ground hog / predator.
This is probably more that you wanted to know but I'm very passionate about this system.

I'm also addicted to ground hog hunting.
