Here is something for those people who happen NOT to be the man with the superior line of reasoning, who knows everything there is to know about manpower because of his EU3 MP experience, to think about. The manpower provided by a province is based on its base manpower, its base factor, and buildings providing a fixed boost, which is then modified by provincial percentage modifiers. Wrong culture gives a -33% modifier to manpower. As I noted in post 75, this is additive, not multiplicative. Other relevant modifiers for somebody playing Muscowy would be the following: Russian Traditions +25% (you get this from the start) Russian Ambitions +100% (you get this as soon as you have 21 ideas, which can be accomplished with 3 full idea groups) Thus, completely disregarding other provincial manpower modifiers such as from the Offensive idea group (+25%), the Aristocratic idea group (+25%), and the Quantity idea group (+50%), and assuming that none of the higher tier army buildings are built (tier 4+ increases the local manpower modifier, up to a total of +70%), any Muscowy that is out of the early game is rocking a base of 225% manpower in every single core province before culture is calculated into the mix. Which means that the difference made by the culture to manpower is the difference between gaining 192% of base manpower and 225% of base manpower. Yes, the later is better than the former, but it really is not all that big a deal, and especially not when compared to e.g. dumping DMP into exploration/expansion and getting more provinces providing manpower in the first place. But overall, even without any of the huge benefits Muscowy gets, even if it is 67% vs 100% (something that is never the case for Muscowy, which cannot go below 92% vs 125%), in Eu4, huge increases to manpower are gained by controlling vast amounts of territory (yes, certainly, conquering Lithuania for the manpower is a fine idea) and spamming them with cheap military buildings or by choosing the proper idea groups. Overall, culture conversion plays little part, and for Muscowy in particular the idea that mass cultural conversion provides a significant boost to manpower is a joke. If you really must do it, do it in conquered provinces that have a low base tax and a high base manpower to get the most bang for the buck, but even then, you would probably have been better off in both the long and short run spending the DMPs on other pursuits unless you get exceptionally good DIP monarchs and thus have more than enough to spare.