I don't reload, so not sure what is required in a reloading log book, but for my other hobbies where I keep a log, I decided long ago that a generic database app is the way to go. Reasons, fully customisable. Specialist databases/logs tell you what information you should be recording rather than the information you want to store. Secondly, big database apps have longevity in terms of support and updates. Bespoke, specialist apps tend to come and go. I use Tap Forms.
I don't mean to piss on anyone's party and if the OP can build a good app, I hope it works out.
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