Thank for your answers.
I allways have problem shooting fron bench, first I used sand bags holding the rifle and resting the back of the forward hand on bags.
Also try shooting resting only elbows and sometimes I get two groups.
http://forums.nitroexpress.com/showflat....=true#Post87404

I found a post on other forum and try to shoot this way without success as you can see and I want to share my experience with you. I learn alot here!!!!
The rest I used was almost identical to the one it is used by most doublegun maker as Brown in his new book. It is a horizontal branch covered with carpet.

If you consider only 5 of 6 shots (I suspect I pull the sixth), regulation is very good, 2" at 50 meters!!!!!
I just start filing the back sight.
Thanks
Martin