My style is more ‘tight’ than ‘wild’, but I’ve done:
R1: 1art 4tnk (all in Moscow and Caucasus empty, if Ukraine doesn’t fall to keep Caucasus defensible)
G1: 4inf 7art, also 8inf 4art and the usual 9inf 2art 1tnk
Guess more frequent ‘reactive’ buys don’t count, like:
UK1: 5inf 3tnk (when a large landing threatens)
UK1: 3ftr +US1: 2bmb 4inf (when Germans fleet comes out)
J1: 2 factories (when scattered UK ships are hard to beat fast)