See my full notes on Fire lapping a rifle.
These are parts of our class notes for conventional high-powered rifle competitions.
All brand new conventional competition high powered rifles should use fire-lapping to ensure that the barrel is super-smooth and clear.
How to fire lap a rifle
After each of the first 10 shots:
1 – Remove the bolt
2 – STARTING from the breech end, run a brush wet with bore cleaner one-way out toward the muzzle end of the rifle.
3 – After the brush exits at the muzzle end, remove it and withdraw the rod.
4 – Run a clean patch, one way from the breech to the muzzle end of the barrel. The third patch should look clean.
For shots 11-24, the fire-lapping is done every two shots.
After 24 rounds, the rifle is ready to accept telescopic sights.