Hi I bought a ruger 10/22 yesterday complete with scope and silencer yesterday from a gun shop. It is only a month old I tried to zero it yesterday and after shimming the rail at the rear I managed to get it on the target at 25yds, before shimming it was 18 inch low at 25yds. I then extended it to 50yds and carried on but the best 5 shot group I could get was about 8 inch. Last night I checked everything was tight, and that the stock was on correctly. Today I tried again but it will not group well at all instead it makes patterns usually quite narrow but very tall the best I could get was 8 inch high and 4 inch wide, and I had one 14 inch high and 6 inch wide and a few in between these. This was from a lying down position I have put over 150 bullets through it and it is useless. I have tried it without the mod on and it s no better. And I have tried a different scope as I thought it was the scope.
Can anyone offer advice as to what could be the problem.
I also have a CZ 527 .223 and I have no problems with that I get 1 inch groups at 100yds whilst resting on the land rover bonnet using factory ammo.