Weyl metals, characterized by topologically protected band crossings, are promising for investigating Berry-curvature-mediated transport and developing spintronic devices. Through first-principles calculations, we predict that hexagonal ${\mathrm{Fe}}_2\mathrm{MnSn}$ with the $\mathrm{D}{0}_{19}$-II type structure exhibits magnetic Weyl metal behavior. Two symmetry-protected Weyl nodes situated 24.6 meV and 6.5 meV above the Fermi level, whose cooperative Berry curvature generates a large intrinsic anomalous Hall conductivity (AHC) of 881.6 ${\mathrm{\Omega }}^{-1}$ ${\mathrm{cm}}^{-1}$. Experimentally, polycrystalline $\mathrm{D}{0}_{19}$ type ${\mathrm{Fe}}_2\mathrm{MnSn}$ shows a substantial enhancement in AHC from 162  ${\mathrm{\Omega }}^{-1}$ ${\mathrm{cm}}^{-1}$ at 350 K to 303 ${\mathrm{\Omega }}^{-1}$ ${\mathrm{cm}}^{-1}$ at 10 K with the intrinsic component of 281.5 ${\mathrm{\Omega }}^{-1}$ ${\mathrm{cm}}^{-1}$ extracted through Tian-Ye-Jin (TYJ) scaling, constituting 92.7% of the total AHC and directly confirming Berry curvature as the dominant mechanism. The discrepancy between theoretical and experimental intrinsic AHC values is attributed to the coexistence of the competing $\mathrm{D}{0}_{19}$-I type phase induced by Mn disorder, which disrupts the ideal Berry curvature configuration. This disorder-mediated phase competition offers a new perspective for designing magnetic topological metals. Our work suggests ${\mathrm{Fe}}_2\mathrm{MnSn}$ as a promising candidate for exploring Berry-phase-driven transport in magnetic topological systems with multiple atomic occupations.

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• Electrical conductivity
• Electronic structure
• Magnetism
• Spin-orbit coupling