Discussion
Choose the correct option in what is 'washing effect'.
(I) It is a gradual erosion and carrying away of the metal by the gases at higher temperature
(II) It loosen the barrel and affect both aim and range
Answer: C
Both (I) and (II) are correct.
The washing effect is the erosion of the bore, especially near the chamber, by the hot propellant gases rushing past the bullet at high pressure and temperature. They melt and carry away fine layers of steel, which is statement (I).
As this erosion builds up, the bore widens and the rifling wears away, so the bullet fits loosely, gas escapes past it and it no longer spins true. Accuracy (aim) and range both fall, which is statement (II). Because both statements describe the effect correctly, options accepting only one, or neither, are wrong.
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