I was in the industry for a bit. Never saw factory ammo on consignment. Occasionally there was a bit of ammo with a rifle on consignment but it was pretty rare.
Factory ammo was like all other items from importers and you paid for it by the due date which varied between on delivery to 90 days. Most were 30 days.
I suppose in theory that business could have had $100K of ammo land but not paid for yet that would falsely corrupt the figures.
I never saw 400% but did see some small items that got pretty close to that.
Anyway just my my historic imput.
Cheers
Chappo
"Only accurate rifles are interesting". Col Townsend Whelen