Hi guys

Sorry to post another thread on nitro proofing, but alas I need some help

The gun in question is a Hammer gun , I Hollis and sons with a Jones under lever
I did some research on a rifle I recently purchased and narrowed the manufacturing date down to between 1896 -1904

So I looked at the proofs and was convinced that it was fully nitro proofed but reading more and more threads lately I am second guessing myself an I decided to ask the help of the experts on the forum

Hope you guys can give me some solid advice

Is the gun good for full nitro loads ?(Mechanically it looks sound, bore is pristine, locks up site)
Is it more suited for nitro for black power loads?
Is it a BP gun that was reproofed to nitro ?

Thanks in advance

Kind regards