The fact is Peter you sleeved it.... and its probably like for like at the end of the day, I'm talking more on the lines of someone just plugging it with just a screw etc.
A few years ago, I was asked to shorten and lighten (Turn down the diameter) a .22 barrel off a BSA Martini Action target rifle, I proceeded to cut the barrel to length and re Crown it, then looked at turning it down, It had a scope mount on the barrel just forward of the chamber, which I had to remove * removing the two screws I found one of the threaded holes was very deep...... too deep to be precise, between the bore and the hole it was .5mm thick....... it was too late to do anything with the barrel as I'd already cut it just over 12".
Lesson learnt, in future strip it completely of anything then proceed to cut, if I had of noticed it earlier I could of cut off the bad bit and still be left with plenty of meat to re thread and cut the chamber then cut to size.....
* Lot of .22 target rifles had mounts fitted to the barrel to take the long scopes used.