One fun toy I have is an old, shooter grade Savage 1899F in .22 HP from 1918....which wouldn't shoot ANYTHING besides the .228' Sisk 70 grain bullets, which can be hard to find. It wouldn't shoot any .224 inch bullet, despite trying dozens of various weights and lengths at various velocities. It would keyhole any other bullet, .224" or .228" at any speed. Instead of selling it I lined the bore with a 1/10 twist Douglas .224" bore.
The gunsmith did an awesome job and it is impossible to tell that the original bore was drilled out and lined with a new barrel. It shoots several different bullets just fine now.
