Barrel has BSA factory inspector stamps (the script B). The underside of the reinforce has 96 (the date) marked beside the final Chief Inspector mark (larger crown and 1)
The rifles that were purchased in 1896 came from early production. In fact, the first rifles shipped to equip an overseas army was to Canada. Which meant that for a short time, Canadians had more advanced arms than the Brit Army, as they still were using the Lee Metford.
There is a good book, "Defending the Dominion" by David Edgecombe that details serial numbers and contracts.
The X mark produced with a hacksaw blade I have seen before and is is typical to rifles taken out of service from the Royal Military College. Not a conclusive marking as anybody could have done it, but it looks the same and is in the same location as that of the marking on a bonafide RMC marked unit. It fits with the Canadian connection.
What other pieces did you get with the action? Buttstock?