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Reloading Data » Rifle reloading » .458 Winchester Magnum

.458 Winchester Magnum

Test barrel: 635 mm (25”), 1 in 14” twist
Primers: Large Rifle Magnum
Cases: Winchester, trim-to length 63,30 mm (2.492”)

Bullet Powder Starting load Maximum load
Weight Type Mfg C.O.L Type Weight Velocity Weight Velocity
[g] [grs]     [mm] [in.]   [g] [grs] [m/s] [fps] [g] [grs] [m/s] [fps]
22,7 350 RN Hornady 74,9 2.949 N120 4,13 63.7 712 2336 4,53 69.9 748 2454
            N130 4,46 68.8 730 2395 4,80 74.1 773 2536
            N133 4,72 72.8 730 2395 4,90 F 75.6 F 756 2480
25,9 400 A-Frame Swift 82,0 3.228 N130 4,30 66.3 674 2211 4,55 70.2 710 2329
            N530 4,90 75.6 691 2267 5,10 F 78.7 F 722 2369
            N135 4,80 74.1 677 2221 4,90 F 75.6 F 692 2270
25,9 400 XFB Barnes 83,0 3.268 N130 4,00 61.7 631 2070 4,36 67.3 688 2257
            N530 4,50 69.4 645 2116 4,70 F 72.5 F 674 2211
            N135 4,30 66.3 625 2051 4,42 F 68.2 F 644 2113
32,4 500 RN Hornady 84,0 3.307 N130 3,60 55.5 557 1827 4,11 63.4 623 2044
            N133 3,85 59.4 564 1850 4,52 69.7 645 2116
            N530 4,20 64.8 589 1932 4,76 73.4 655 2149

F – Case full