I have shot a number of 1/2" groups with mixed head stamps.
That is in a heavy barreled .223.
I have shot a number of 6" groups with matching headstamps.
That is in a light barreled 30-06.
Based on my limited anecdotal experience, mixed headstamps makes groups a dozen times smaller.
The word 'forum" does not mean "not criticizing books."
"Ad hominem fallacy" is not the same as point by point criticism of books. If you bought the book, and believe it all, it may FEEL like an ad hominem attack, but you might strive to accept other points of view may exist.
Are we a nation of competing ideas, or a nation of forced conformity of thought?