In the olden days, when Sako and Lapua made shitty cup'n'core bullets, "going light" meant that your bullet could blow in moose shoulder, resulting in wounded moose, lot's of extra work and also wasted meat.
That resulted going up in weight, especially since almost only use for softpoint was moose hunting. Bullet design also got better, but for some reason Finnish bullet makers never produced bullets with true premium features. Also Finnish legislation favors higher weight bullet, by having lower energy requirements for them.
So when Sako started using Barnes bullets and Lapua came up with Naturalis, they didn't dare to use lower weights. Part of this probably is the hunting culture, moose is still the dominant large game and shots are very close for typical hunter. Like 20-30 meters. So in most cases there were no problems, and most people used the upgraded Hammerhead/Mega bullets anyway, since they were considerably cheaper. Naturalis had and has shitty BC, and Lapua went through several generations to get adequate expansion at distance.
Now that Sako came up with Blade, they still didn't dare go to appropriate weight (IMHO 150gr in 308). Also the BC is not the best. They have tested lower weights also (at least 120gr and 150gr) and it seems 150gr is available as 840m/s factory load even though it's not listed at Sako site. But apparently they've done decent job with design and the 162gr factory load expands as well or better than their previous Barnes offerings. Lower velocity also means the bullet is not so violent on those 20 meter shots.
Part of the reason to keep the weight up might be change in Finnish legislation. The weight limit for largest game was lowered to 115gr for non-lead bullets, and also the energy requirement was lowered. So if you offer something like 120gr 308 factory load, there will be uneducated people who go and use it on moose. There's some fallacy that weight retention equals penetration. But when lighter bullet expands the same or more than heavier, the momentum just isn't there.
