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Today I bought a set of those Lee scoops in the 83 different sizes measured in CCs.
The tab with the set does not list Triple Seven but it seems to match pretty close to real black in FFFg.
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A CC is about 15 grains of black powder. Black powder subs must be measured by volume as if they were black powder. The actual weight will be considerably less than the volume weight.
Always measure black powder subs by volume unless the loading info specifically state "these charges are by weight".
30 grains volume of 777 does not equal 30 grains weight of 777.
30 grains volume of black powder is very close to 30 grains of weight. Most volumetric powder measures err on the light side, a liability thing I guess.
One example of a black powder substitute where the cartridge load info states that "these charges are by weight, not volume" is the cartridge data for Blackhorn 209 on their website. However, their muzzleloader info is strictly by volume.
What I'm tryin' to say is that when triple seven, pyrodex, et al, state "30 grains", they don't mean it literally.