First off I never said mine would do it all day long. In my 55+ years of shooting I've had 3 factory rifles that would shoot 1/2" or better if I did my part. Hate that statement or not it's true. Some days you're just into it more than others. One of which I still own and I am going to give to my grandson this year. If you don't believe me - well that's your prerogative. But don't call me a liar.
And while we're on this subject I just remembered that I had a butt ugly H&R Handi Rifle in .223 with a bull barrel that looked like it was finish machined with a bastard file! I had it to a range in FL back around 2000 and after a session on the line, the range officer came walking past and asked how it was shooting. I told him to take a look. After peering through my spotting scope at the ragged hole about 3/4"-1" he asked how many rounds were in there. He was shocked when I told him at least 15 and showed him the empty cases.