I have A Highwall with an older 40-65 18 twist that is ready to make into a 25-20 for Quarter Bore Matches and  strictly A benchrest gun. One of the best I heard was have a Douglas/ Lilja or Shilen barrel, made up in .750 dia and slip it in as a barrel liner, alittle more pricy, but sure beats $600.00+ for A new barrel fitted. 
Any of you fellow shooters that have barrel liners, I'd sure like to know how they are in benchrest accuracy and final cost ready to shoot. Thanks, Pete

  Hello Pete :

          Before you get too far into your preparation of a piece for the 1/4 Bore matches, might I suggest one thing.

         The ASSRA Quarter Bore Corp has a set of parameters that are closely followed.  You may want to familiarize yourself with exactly what the regs entail prior to working up a rifle expecting to compete.

        I will not speak for Quarter Bore, as he would be better able to offer you guidance on the issue.

        Good Luck
        Creedmoormatch

There's always the Quarter Bore postal.  And may I suggest having the back end of the barrel liner turned a little bigger for the length of the chamber to 1, keep all of the chamber and walls in a thicker section, and 2, making sure it gets installed on the right end of the liner.

Enough shooters are starting to shoot them here in Montana, wyoming, Idaho and Wash. I guess if the action is sitting here ...might as well use it. Cheap practice!.

I would spring for a new barrel so you know where you stand right out the gate. If you were to install a liner and it did not shoot up to your expectations then you would have a tendency as I would to blame it on the liner. At that point in time we would both forsake all the variables, time and effort one needs to spend in load development to get it to shoot. With a new barrel you would bypass all that frustration and move forward to do all that you can to get the new barrel to shoot as there would be nothing to put the blame on but yourself.

J.Louis

I have a 32-40 barrel used as a  liner slipped into a Swedish rolling block 16 ga shotgun barrel. It shoots exceptionally well.

i have one lined barrel and it shoots better than the original did. old one was worn a little but...
shilen stainless made into a 25-20 wcf is a neat shooter  reasonable cost through brownells

Liners are made from 4130 steel which is a bit softer than 4140 heat treated steel used in most modern barrels. The 4130 is better than the metal used in old black powder barrels. The 416 Stainless steel barrels are not as hard but they will not flame cut like other steel barrels, can't cut with a cutting torch and the throat will not be harmed with the high heat from burning powder.
Turning down a high end barrel to make a liner would be very expensive. Barrel blank could run over $500 before you get started. TJ's liners are sold by the inch so most are under $200 depending on length. The 36" liner I bought recently was $214.
A customer sent me a picture of the group he shot with his lined 22 LR at 50 yards and it could be covered with a dime.

I can't say Cryo will help but I have found that many shooter do better if they think their gun will do better.