I have been doing a lot of research on this rifle and decided to purchase one. I know there are a few members here who own one. Have any of you who own one tried it with a wildcat cartridge or caliber that DTA does not currently offer? So far I have seen these rifles do 3/8moa, have any of you got it to shoot better? And finally, after 30 or so rounds does this rifle ever shift POI (I plan on competing with it)? This is my only concern or hesitation with this rifle, any input would be appreciated.