Oddjob, if you only hook up to sockeyes, then even leaders of 8-12 lb will do. Ah, the problem is, you may hook into a spring, and every one around you don't want to wait for you forever to land it...
Also, what happens when your skinny line crosses up with a snagged betty with a beefy leader of 30+ lbs strength? You lose every time. That is the tough dilemma.
Seabird bar has 3 sections. The top end is where every body stands in the water with wader. It is quite snaggy inside, and a slower retrieve of 3 oz weight will risk losing it quite easily. The section from the top to the start of the crescent-shape bar is very slow & deep inside, making it tough to bounce. Very few people fish it. Then the start of the crescent bar is the deeper spot where springs like to sit. Fish there if you want a higher chance to hook into a monster. The shallower section below is also good for spring, but more so for sockeye. You should try to cast medium distance. Overcasting can get into snags, as well as too close to shore. As a rule to avoid snagging, try to cast 11 to 12 oclock, reel in slack line before bouncing, and maintain a tight tension in your line. Also retrieve earlier if you find snags closer in.
Good luck and tight line.