If you have it rechambered to .25-20, and keep the .25 Stevens bore, then you may suffer poor accuracy with bullets for the .25-20WCF! The .25 Stevens RF is a true .25 caliber at .251" bullet diameter, but a .25-20 uses a .257" bullet and will be much too large for your Stevens bore. You could have the bore re-rifled deeper to handle the larger bullet.