Yay, I too have been playing as Sweden.
But the game is Victoria: Revolutions, and I haven't formed Scandinavia. Norway is my satellite and I'm allied with Denmark though, so it's kind of a Kalmar Union. The year is 1925(?), and I've formed a new Swedish Empire. I have all the shore provinces of the Baltic Sea except Viipuri and St. Petersburg. The funny thing here is that I've conquered only three of those provinces, rest of the bunch I've acquired by trading. As soon as the game started I improved my relations with Russia to +200 and made an alliance with them. Sweden has a high literacy rate and thus researches technologies fast. One tech with +200 relations is roughly worth one non-core province, so I managed to exchange Finland to techs with Russia without too much fuss. Then I realized that Russia doesn't have cores to Baltic provinces. Those I acquired by first conquering Siak and Atjeh and exchanging those provinces to Estonia and Latvia.
Then came the time for the wars of German unification. Prussia beat France without too much effort, they even conquered Paris while Austria reached the Atlantic shore. When Prussia declared war on Austria I saw that my chance had come. I immediately moved all my troops (approx. 30k men
) to Libava, my only province bordering Prussia, and declared war on those pesky German bastards. Prussia was expecting an easy war, but instead of an equal-sized Austria they got to face Russia on steroids: because of their trades with me, they weren't a backwards nation but one of the leading countries in the world. Russian army steamrolled to Berlin, no hope for Germany to unify. Russia negotiated a couple of provinces to them in the peace treaty, I traded those to some techs and colonies in Asia.
With the Prussian-Austrian alliance broken, I bribed Austria to like me and made an alliance with them. With the unholy alliance of me, Russia and Austria, Prussia was practically destroyed. War declaration, I conquer a province on the shores of the Baltic Sea, Russia and Austria kill everything in sight, peace treaty, trade provinces with Russia, peace treaty ends, rinse and repeat. At one point even France joined my alliance, although they only stationed their troops in Metz and waited for Russia to do the job.
So now Prussia has approximately 10 provinces, Hannover shares a border with Russia, Baltic countries and Pommern have been returned to Sweden. Me likes.