You may be running into the issue mentioned below:

"Note that the earth is not “round” in the game and your missiles cannot cross an invisible wall at the International Date Line (180 degrees longitude or middle of the Pacific Ocean)."

Thus if you are firing from China/Russia eastward to the US, there's not enough range since the missiles cannot cross the invisible line and don't have enough range to go the long way around the Earth.

Hello, thank you for your work. However, I have noticed that there are issues with the ranges of df41 and ss-27. The maximum range of the missiles is only 4,000 nautical miles. Beyond that, they cannot be launched.

nuclear bombz....

Rediculously good - I can't even imagine how you do these kitbashes, but F me they work.

bro push limits of kitbashing every time! Great work!