Marc, the 25-20 is deer legal in many states.
...but who cares(not that I don't take your word on the subject - I don't), but I've only shot crows and toothy varmints with it.
The Fraser rifle came out of the north of England by a well-known collector/seller of Frasers.
Due to the lack of the 250 cartridge, the rifle was re-barreled to 25-20. The old English vicar, by his accounts did shoot his fair share of roedeer with the pip-squeak round.