Please take a look at the second page, top 1/3 of the page, in bright red and bold. Same warning on page 3, and page 6, and throughout the manual.
Top of page six reads: "ALWAYS USE THE CORRECT AMMUNITION FOR YOUR PARTICULAR FIREARM as indicated by the marking on the firearm. Never use non-standard, reloaded, or "handloaded" ammunition which has not been subjected to internal ballistic pressure testing."
The top of page ten is a huge, bold, red disclaimer and warning on the use of handloads.
Big old warnings all throughout that improper use or use of improper ammunition could cause serious injury or death.
I'm not seeing how T/C didn't properly advise customers of any potential dangers and how they produced a faulty manual (one of the jury findings). It's in bold, red, and plain English on damned near every page.
There it is in plain view that not only does Thompson Center endorse handloading as a practice, they feel it is safe in their products and they profit from the advertising specifically aimed at selling their products to those who handload.
So, does that cover auto manufacturers for any fools who want to go all "Fast & Furious" because car companies places adds in high-performance car magazines? How about motorcycle makers that buy ads and have articles written about their wares; does that mean that they are liable when someone hotrods their bike and acts a damned fool? They feel it's safe to have their products so tested and publicized and they profit from the advertizing specifically aimed at selling their products to those that exceed safety and legal limits.
I don't know, it depends. Some dangers are open and obvious, others are not. With the case of cars and motorcycles, the question is not the modification itself, but how the car is driven after the change is made. And the dangers of excessive speed easily fall into the "open and obvious" category.
And besides, it really analogous to what is done by TC. Take a look at that cover. It advertises a TC Encore in a .375/44 Bain and something or another. TC made a barrel in a Wildcat cartridge that can ONLY have ammunition in it through the process of handloading. Thus the issue is not whether that firearm is safe with handloaded ammunition as that there is ONLY handloaded ammunition, the issue is whether that firearm is safe with ammunition loaded to the pressures in the cartridge for which it is designed.
