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IF I remember correctly, believe the old saying was 2000-2100fps was optimum back in the day for heavy DG bullets.. however, think a lot of the 458W Mags were much slower than the advertised velocity when it first hit the market due to several factors.. In todays world with better powders, its a better caliber carried by many in Africa..
Yep the .458 Win Mag in practice and in actual use developed a bad reputation precisely because of the inadequacy of the sub 2000 fps velocities. As a DG cartridge it nearly died. With new powders a resurgence.
Yet the .45/70 with even less velocity is so effective ... 
I think I will have to try my .577/450 sporting rifle on buffalo!
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