  We study the longitudinal magnetotransport in three-dimensional multi-Weyl
semimetals, constituted by a pair of (anti)-monopole of arbitrary integer
charge ($n$), with $n=1,2$ and $3$ in a crystalline environment. For any $n>1$,
even though the distribution of the underlying Berry curvature is anisotropic,
the corresponding intrinsic component of the longitudinal magnetoconductivity
(LMC), bearing the signature of the chiral anomaly, is insensitive to the
direction of the external magnetic field ($B$) and increases as $B^2$, at least
when it is sufficiently weak (the semi-classical regime). In addition, the LMC
scales as $n^3$ with the monopole charge. We demonstrate these outcomes for two
distinct scenarios, namely when inter-particle collisions in the Weyl medium
are effectively described by (a) a single and (b) two (corresponding to inter-
and intra-valley) scattering times. While in the former situation the
contribution to LMC from chiral anomaly is inseparable from the non-anomalous
ones, these two contributions are characterized by different time scales in the
later construction. Specifically for sufficiently large inter-valley scattering
time the LMC is dominated by the anomalous contribution, arising from the
chiral anomaly. The predicted scaling of LMC and the signature of chiral
anomaly can be observed in recently proposed candidate materials, accommodating
multi-Weyl semimetals in various solid state compounds.
