how much you feed depends on the protein level in the pellets you are feeding. 13 vs 16 vs 18%.
It also depends on the fodder, hay, grains, treats etc that you feed them.
Some people feed extras, others do not.
It's a bit of a experience gained game. Culling your rabbits regularly gives you needed information.
For instance.
on 16% my meat rabbits consistently needed 1 cup pellets, bucks and does alike.
On 17% the nursing does need 1 cup, resting does 3/4 cup, bucks 2/3-3/4 cup. When feeding lots of greens I can get away with feeding less, or they leave pellets behind and I just top up to what I would normally give them next feeding.
I just took in three meat rabbits that were being fed 1 cup of 13% pellets and they are thin and smaller than they should be for their age. I butchered one of the three and there was ZERO fat on him, like NONE. There should have been at least some fat but nothing.
My project holland lop/meat rabbit crosses need a maximum 2/3 cup of feed. Any more than that and I get fat rabbits. My youngest buck from that cross eats only 1/2 cup pellets.
Translating that down to my dwarf breeds.
used to be 1/2 cup
Now they only get 1/4-1/3 cup depending the size of the rabbit (and their activity level).
Protein percentage in your pellets I find means more than anything else you feed.