One interesting note here: Sometimes I´ve been shooting with the bipod (Harris) resting on ice. Generally it gives me the least horizontal dispersion compared to other surfaces. I have lightly pulled the rifle against my shoulder with my right hand then, left hand supporting the sock. Is this an indicator of my bad hold somehow, is it possible that the bipod is sometimes bent or binding when shooting on harder surfaces, thus throwing the rifle off-center during the recoil? Random vibrations? My only problem is horizontal and this light TRG-S 338 LM jumps quite high, sometimes off-center and then I know right away that I hit bad. That doesn´t happen on an icy car top,for example. It recoils straight up then. I use a sock supporting the buttstock. Replaced with a sandbag, the POI rises almost 1 MOA. (I´m not sure why I mention this now) Is it possible that I should try holding the rifle with a little more shoulder pressure against the bipod to keep it consistant, and / or push the buttstock a bit more firmly downwards? Or pull the rifle with the right hand? Hmm... There´s no shortcuts I know, just some thoughts here. Nothing moves when dry firing, no flinch and my follow through is fine,stance is natural and comfortable. If I get this fixed I´ll be in consistant 1,5 MOA / five shots club and ... hmm, that would be a good start. Ideas,please? This rifle is so doggone sensitive to any mistakes,it´s a real challenge. Dropping the bipod is not an option.