Return Pending Ammo for Credit

You can return ammo that is Pending that hasn't yet been allocated to your Stored Ammo. Just find the Ammo Plan you want to return ammo from, go to the Pending tab, and click the "Return" button next to the caliber you want to get credit for:

Just click the yellow button marked "Confirm Return" at the bottom of the confirmation page to complete the transaction.  When you do this the system will convert the value of these rounds into account credits (with no loss).  You can either use the Buy More button to use these credits for another caliber, or let your AutoBuy use them the next time it runs.