Donaldo.
Don't bite off more than you can chew. The barrel steel per se is quite good even so it is the cheapest part of a rifle. Most of the rifle barrel steel is made by one company. The quality of boring, reaming, rifling , contouring and stress relieving is another story and that is where the cost comes in.
I inspected the 25-06 barrel with my Hawkeye bore scope, that is every inch of it. The scope is fiber optics 22x with a battery powered light. I have not found a single inclusion in that barrel and it was a whole lot smoother than a lot of other barrels that I looked at over time. It took very little to break it in, and it cleans real easy. That itself ought to tell you something.
I am not about to name the worst ones but H&R is not one of them. If they H&R ever get their act together and make a proper sized bore and chamber, they will be as good as any factory barrel. I could tell when I made the notches on the end of the barrel. This steel is pretty good it is chrome moly a good standard barrel steel.
I can test the steel quite easy for Rockwell hardness if I felt it needed it.
No I don't want a 257imp. The standard 257R will practically duplicate the 25 Hunter but with less pressure. The 25Hunter is one heck of a cartridge but it likes to operate at high pressure.
I got an estimate of $185 Can for the rebore and chamber. Octagon?
I think it will make one nice little rifle and different from others. Something to talk about and to look at. Even a cheap Remington rifle costs $800 in Canada. Ultra $362+300for the work and rebore $662 total. Ruger#1 new in 257R $1100.
Ron Smith the man that rebores barrels and makes them too is good perhaps the best in Canada. He can tell whether the steel is good or not.
He makes record winning BP barrels cut rifling only. Loves single shot actions like the Miller.
I will install two single scope bocks on the barrel like I did on the Ruger #1 and completly re-do the stock. The barrel work will take three month because of back log. You ask now you know .
The 25-06 toke 6 month to get so here we looking at 9 month already. It will be just done for next hunting season. That is not funny.