W. Ellis Brown, I am sure, did not make calculation errors, in doing the math. for the 16 gauge action to 7x57R conversion, but clearly did make errors in the proof reading of the book, though it was proof read by several people trying to sort out the various errors prior to printing. I took the conversion class at gunsmithing school in MN from Brown, prior to his writing book on same subject, thus I know that he wouldn't have made such silly mistakes, but I am sure that they simply occurred as a result of the long drawn out process of writing the text, several stages of proof reading, etc. A ton of errors were found in the first proof reading, but many still remained, and even in the second edition, many more were found and eliminated, but some still remained; even I must say that this is amazing, though I know from personal experience how difficult it can be, proof reading. Bottom line is that it is Brown's book, and both editions had errors in them that escaped proof reading, so he is to blame for that. Brown clearly later admitted to the errors in the books, and tried to clear up the issues, but that is nearly impossible to do, once books are distributed.