You may find that today its cheaper to buy another rifle before changeing barrels outside of the same family of cartidges and reworking bolts and mags can run the cost up even more. Maybe get into reloading and then you can tune that 35 and 300wsm in to what you want . Even tuned down to lead bullet loads for plinking at black powder levels or stepped up to max levels. Even a free take off barrel may not be worth any cost ether. Most come off for a reason that relates to accuracy issues.