I'd just like to say that JL-2 canisters are pretty much the same size as df-31A (not AG, which are slightly longer) canisters, when measured from end to end of the cylinder area. The difference is something like JL2 being 3% shorter. Actually jl-2 has slightly bigger protrusion both up front and in the back. Part of that is, of course, the larger gas canister used for pushing the missile out. Anyway, I'd say if df-31a is indeed up to 11 000 km in range, then it's pretty plausible jl-2 isn't far behind. Certainly possible to be in 9-10 thousand km range bracket.