I'm no expert but applying what I've learned on the Forum I have turned in some pretty consistent tight groups when load developing for my NULA and Finnlight 7/08's by:
Adjusting my Model 500 Rest to just in front of the magazine with a folded towel under the forearm; firm hold on the forearm in front of the front rest with my off-hand pulling the stock into my shoulder; rear rest elevated to allow for a more upright position; using a padded brick to elevate the elbow of my trigger arm; light grip on the wrist and smooth trigger pull; and NO contact between my chest and the bench.
Again works for load development and scope zeroing for me.
