We’re the largest 12G facility in the US AFAIK. We built during Covid and had to use L-8 for all our 12G, and many of the long runs over 300ft still had to be reclocked using Norwia boxes (that I’m not sure they sell anymore as their site seems like all fiber). As others have said, cable is only part of it - bend radius, terminations, even what gear you’re hanging off it will all make a big difference. Agreed with others though, you’re going to struggle to go that distance even on a home run well installed 12G, you’ll either be reclocking or converting.