Creeping more of your posts, what borescope are you using? Looks fantastic, I just asked for options on rimfire central and most people suggested the teslong so I ordered one yesterday.
Back in 2020 I ordered the Teslong Rifle Borescope, 0.2 Inch Gun Barrel Bore Scope. Looks like that particular one is currently unavailable. Paid $70 for it back in June.