Answer
$\lambda=3.2\times10^{-35}\,m$
The wavelength is too small and can be considered negligible. Therefore, wave nature of matter is not significant for bullets.
Work Step by Step
Mass $m= 27\,g=0.027\,kg$
Velocity $v= 765\,m/s$
Wavelength $\lambda=\frac{h}{mv}$
$=\frac{6.626\times10^{-34}\,Js}{(0.027\,kg)(765\,m/s)}$
$=3.2\times10^{-35}\,m$
The wavelength is too small and can be considered negligible. Therefore, wave nature of matter is not significant for bullets.