Handgun barrels don't have the rifling count, nor the length to warp. The more likely scenario would be coppering or leading, depending on the bullet jacket, of the barrel riflings, which would impede accuracy. However, in this case, I highly doubt accuracy is a concern. (Old saying: if there's no lead in the air, there ain't no danger) :happy-smileygiantred:
Rifles, or long barreled weapons are a different story. The more rotations (twists/riflings) per inch, the more accurate the rifle. Although there is a down side, the more riflings, or twists in the barrel, more heat is generatedand barrel life suffers.
I own a heavy barreled . 220 Swift with a 1 in 8 twist (24" barrel), meaning for every eight inches of barrel the bullet travels it will rotate 360 degrees, or a full rotation. Barrel length is also a consideration when it comes to accuracy. Many weapons the military use (M-16) have 16" barrels for weight and maneuverability considerations. Their long range accuracy (1-14 twists) is between 200 and 300 yards.