The closest I come to finding is related to the "Ruger Letter" of 30 March 1989 and the following interview with NBCs Tom Brokaw where he said "no honest man needs more than 10 rounds in any gun…"
Well, Bill Ruger did say that civilians should have a restriction on magazine capacity. I've heard that restriction described as 5, 10 or 15 rounds. He went on ABC and in front of Congress saying these sorts of things. He wrote these things in letters to all 535 members of Congress on behalf of gun manufacturers. He was in a very real way responsible for the 1994 Assault Weapons Ban and 10 round magazine capacity limit we all lived with for ten years. IMO, with friends like that, we don't need enemies.
I was upset with Ol' Bill long before the AWB.. Seems as though Bill decided that the Ruger-paid employee health insurance wouldn't cover motorcyclists injured while not wearing a helmet in a state that had no helmet laws, but that skydivers, skiers, car racers or other forms of recreation were ok.. It seemed discriminatory to me, and I wrote them to that effect.. My reply was a gracious reply of "so what?" buried deeply in a few paragraphs from Corporate.. .. Sooo...I traded off my 10-22's and my MKII's for AMT firearm replacements, knowing that AMT was a thorn in their side by making high-quality all-stainless knockoffs back then.. I wrote them of what I had done and that I'd never buy another Ruger again..
Sometimes I need a very tall ladder to get down from my high horse..