Did you strip the barrel , my 30-06 shoots them( 175 TLR) in a ragged hole , 1/4" BUT it takes around 9 shots after barrel clean for them to fall in . You might already know this , I learned it the hard way. When ever testing monoliths or plated it is best to start with a clean barrel and some times takes many more fouling shots than normal before they tighten up . Federal updated the TLR to I think the Ascention , it has two pressure relief rings and is suppose to be easier to make group . I have several hundred 175 TLR's and I love them , they are killing machines . longest shot so far was right at 650 . I am about to test the 151Absolute hammers , I will post results after I find Mr. Steve's recommended powder H4895 . If you test them further let me know your results I would be interest in findings . Thank you Sir , floyd