Thread: Does a bull barrel help reduce throat erosion?

No is the answer. Throat erosion is caused by the high gas velocity and temperature caused by the propellent.
Hot gas at around two and a half times the melting point of steel at 55,000 or so psi travelling at around 1km per second is quite erosive bit like a plasma cutter. Thankfully its only for around 2 thousandths of a second per shot. So theres no way the temperature can be heat sinked away by a heavier profile.
Heavier barrels are good because they have less harmonic movement so are more predictable shot to shot and take longer to heat up, and longer to cool down.