I couldn't find the post on the cast bullet forum I was looking for but here's some links you might be interested in. Lot's of subsonic loads and talk.

https://www.google.com/search?q=cast+bullet+forum+358+winchester+subsonic+site:castboolits.gunloads.com&prmd=sivn&sa=X&ved=2ahUKEwi8kcilhrHZAhUQwWMKHfvXBsIQrQIoBDAAegQIExAI&biw=1280&bih=800

I'm here to increase my social credit score and rub elbows with some of the highest rollers on the internet.