I like 550's but generally find their stocks (of whatever style) can stand to lose some bulk. The comments about their single-set triggers kind of puzzle me, because I discovered with my first 550 (the 9.3x62) that if you adjust the primary, unset pull to 3 pounds the set feature is bypassed, and the primary pull can be adjust to a very crisp pull. While the trigger is complex, I've been hunting with both rifles for over a decade, including in several dusty and wet places from Africa to Alaska, and haven't had any problems.
I agree, the stocks could definitely be slimmed down.
But I'm puzzled by the comments about the trigger set feature being bypassed when adjusted to 3lbs. I asked a gunsmith if he could take the trigger down to 2 3/4lbs without affecting the set feature. He said he could, and did so. The main trigger trips at 2.75lbs and the set trigger trips at 8 ounces. Am I simply misunderstanding what you are saying?