The Census Bureau produces population estimates for congressional districts based on the ACS.
How close do these match the current districts using your estimate data?
um do they have 2020 estimates? i mean i just looked at the 2016 estimates for new jersey's districts, and it matches up with my 2020 estimates in terms of growth patterns - northeast areas overpopulated, southern underpopulated
No, the ACS is based on a (large) sample. For a single year it is based on around a 3% sample, so they would have household size for every 30th address. For a congressional district that is around 10,000 households, so it should be relative close to a 100% count.
You should be able to compare a projection of the growth from the 2010 Census to the 2016 ACS projected to 2020 - and compare with your alternate projection.
Incidentally, the 2017 ACS will be released on September 1.