This is just helpful tips, use them or not.
1) If your selling specialty ammo, it is best to sell it in as low a bunch as you can.
Most of us that use such ammo typically have a lot on us and during the day like to "top" off our stash.
With the max ammo being 14999, it is easier to sell a stack of 2k ammo then a stack of 10k ammo. During the day, I personally and I know of some others, will buy smaller stacks over a larger stack if it can get us near our max.
2) Do not put specialty ammo in auctions without a BIN if the auction is over 24 hours. I would say do not put it in auctions without a BIN but that is just my preference. The reason is that ammo you have a bid on in auctions counts towards your 15k max ammo limit. And I do not like to keep some of that cap occupied waiting for an auction to end.
Like I said, these are my preferences and does not reflect the entire CB community.
And, thank the heavens for spell check in FF Version 2.