1 pound of C4 does 4d6 damage, and is about 25% more efficient than TNT, so let's say one pound of TNT does 3d6 damage.
Typically an ICBM can field about 35-40 megatons of TNT.
That is equal to 12,000,000d6 damage.
Definitely enough for 825 I believe.
Alone? You mean take to the open...