Not going with the same or smaller caliber, moving from 8mm to 9mm.

I thought about the stepped liner. I'll have to check the measurements, but the profile gets fairly thin near the muzzle.
I'm not set up to turn barrels to liners. I can look into having another barrel profiled so I may make some calls today. Another thing that I don't want is to double the price of the rifle with the work that needs to be put into it. The rebore/chamber job is about half the price of a liner job.
If the method is inappropriate that is a different story. I know that people are doing it, just not entirely sure how acceptable it is.

Thanks
Tom