From: Winnipeg, MB
Only the US AEs can transfer ammo at sea, and only after Jan. 1, 1945.
All the other rules about size of the AE vs the load cost of the weapons still apply. See the table in the book.
There was a thread on this about eight months back where Alfred explained in detail what happens in term of ammo slots loaded, operational points on gaining and giving vessels, ammo cargo available, etc. I was searching for it yesterday but could not find it.
No matter how bad a situation is, you can always make it worse. - Chris Hadfield : An Astronaut's Guide To Life On Earth