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Ballistic coefficient generally goes up as the length of a bullet increases. As the length increases for a given bullet diameter, of course the weight goes up too.
Looking at a Speer reloading manual for 357/358 rifle rounds, it appears that the pistol bullets (up to 158 grains) all have ballistic coefficients in the 0.16 range - of course these are all jacketed hollow points, which you would not expect to be very efficient aerodynamically. With the rifle bullets (starting at 180 grains) you get pointed noses, and find ballistic coefficients beginning at 0.25 and ranging up to 0.45 for the 250 grain spitzer. (Shape matters, but weight seems to matter more.) In the 357 Maximum data, the heaviest bullet recommended is 220g with a BC of 0.316.
To get a ballistic coefficient in the mid-4s (the best of the 35 calibers) at lighter bullet weights you could go down to 165g in 30 caliber, 145g in 7mm, 100g in 6mm, etc.
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