Krusty, the jug overload ammo did exist. However, it may have been used only in strafing missions. I don't really know.
Hmmmm looks full to me.
It didn't exist. Ever. Look it up. Look up actual records and accounts. Look at primary sources. The ONLY instance, ever, where they claim this "overload" ammo was used was on a ferry trip where a group of pilots were attacked and engaged in a fight -- and ONE single pilot claimed that they "must have" loaded twice the ammo because he saw his "end-of-belt" tracers and then had more ammo after it. That's the entirety of the argument for them. Every other source in every instance and even the documents and records recording actual loadouts during combat missions, the math of ammo expended after a plane returned, etc, ALL of it is for the 267-round loadout -- or only slightly higher than that in a small enough percentage of reports that it may have been an unusual loadout or possibly a reporting error. Even the small couple of reports that listed 300 actual rounds are statistically insignificant to the rest of the reports, and most of them are pre-combat P-47C "estimate" reports of what "might" be used. Nothing ever lists more than 300, and the majority of all reports you can ever find are 250-267 rpg.
Fencer: That looks pretty full, yes... Full of 267 RPG. You can see identical images loaded exactly the same way but with the number of rounds notated. The doors on the wings themselves even state the limits of loading 267 RPG and no more. It looks like a lot because 267 RPG is a butt-load of ammo when you have 4 guns per wing. That image, nice as it is, only serves to prove my point along with every other reference.
I mean this literally: it's a fantasy loadout based on a subjective and unreliable account from a single pilot during a ferry flight and ignores other plausible possibilities like -- it was a ferry flight so belting the ammo in the right order didn't matter -- the tracer belts could have been coupled in the middle just to store them for the flight because they were never intended for combat use.