For keeping records of my load data I use Lee Shooter, works well for load information, as to inventory that is a horse of a different color.
I have tried pretty much every thing and it does not work because it has to be kept up to date.
Now here is a novel idea, get yourself a box that holds index cards and a packet of cards. Since we are only talking about inventory and not load data it would be easy to indicate quantity and location on the card. Then when you go shooting, just pull that card and indicate how many rounds used and what the balance is. That way there is no forgetting to turn on the computer and wait for it to re-boot just to mark your spreadsheet.
Jim