I know 300 fps don't sound like much, but to get a 405gr .458 bullet to 2300fps would require a 458 Winchester Magnum loaded fairly warm. To hear someone claim to get that out of the old 45-70 just jumped out at me as being.... well.... huge. That is what triggered my red flag, sorry for the perceived abuse. I've made a mistake on a forum (usually innocent, but a mistake nonetheless) and like yourself I just absolutely hate it. To your credit you hunted down the source of confusion and fessed right up. Its about the only thing one can do and still remain credible. Lashing back don't usually help tho.