Re: "dope" = firing solution. Why? What dictionary?
From the full OED, 2nd. Ed. (comprised of 20 volumes, each volume is the size of an unabridged Webster's):
...
4. Information, esp. on a particular subject or of a kind not widely disseminated or easily obtained; (a statement of) facts or essential details; also, information, a statement, etc., designed to gloss over or disguise facts; flattering or misleading talk. <span style="font-style: italic">slang</span> (orig. U.S.)
<span style="font-weight: bold">1901</span> 'H. McHugh' <span style="font-style: italic">John Henry</span> 77, <span style="font-style: italic">I've known Tommy for a long time, so he feels free to read his dope to me.</span>
...
<span style="font-weight: bold">1917</span> 'A.G. Empey' <span style="font-style: italic">From Fire Step</span> 103, <span style="font-style: italic">I was to send the dope to Cassel and he would transmit it to the Battery Commander as officially coming through the observation post.</span>
...
From the Concise OED, full definition:
dope
· n.
1 informal an illegal drug, especially cannabis or (US) heroin. Ø a drug used to enhance the performance of an athlete, racehorse, or greyhound.
2 informal a stupid person.
3 informal information.
4 a varnish used to strengthen the fabric surface of model aircraft. Ø a lubricant. Ø a substance added to petrol to increase its effectiveness.
· v.
1 administer dope to (a racehorse, greyhound, or athlete). Ø (be doped up) informal be heavily under the influence of drugs.
2 cover with varnish or other thick liquid.
3 Electronics add an impurity to (a semiconductor) to produce a desired electrical characteristic.
4 (dope something out) informal, dated work something out.
· adj. black slang very good.
– DERIVATIVES doper n.
– ORIGIN C19 (in the sense ‘thick liquid’): from Du. doop ‘sauce’, from doopen ‘to dip, mix’.