Sooo ugly tho.....I honestly think that's what killed them, tho from what ive read early rifles had even more issues than the WSMs, which i did see a couple of first hand.My M70 in 270WSM is a laser... Fast, straight, and hard hitting.
The ones that really didnt gain any traction were the WSSM cartridges. The 243 WSSM was a hoot to shoot. Killer varmint rounds.
Performance wise they are pretty awsome.