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Can you include a screen shot with some sample data?

After reading through your description, I found an app on Google Play called Gun Vault Pro which includes a lot of what you've set up but also includes a firearm inventory and stat tracker for $1.49.

However, there are several downsides with the app vs your spreadsheet. Subtracting rounds from a range trip might take a bit of doing. Your spreadsheet solution would probably be easier to manage in that you'd just have to input the number or expended rounds as a negative. Also, the app data is stored on-device with no really easy way to import the information to the cloud or other devices.