I think the best thing I have found the borescope for is checking for throat erosion and how clean the barrel is.I checked one of my best shooting rifles and I was surprised to find quite a few really ugly tool marks,so you never know.Another thing I checked was how much room I have in my chamber for my brass to grow..Here is a pic of the neck of the brass in the chamber
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~Molɔ̀ːn Labé Skýla~
As Bob Hagel would say"You should not use a rifle that will kill an animal when everything goes right; you should use one that will do the job when everything goes wrong."Good words of wisdom...............