Cartridge Dimensions
The .284 Winchester has 4.29 ml (66 grains H2O) cartridge case capacity. The case has a rebated rim and a body almost as large in diameter as that of typical belted magnum cases.
.284 Winchester maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
Americans would define the shoulder angle at alpha/2 = 35 degrees. The common rifling twist rate for this cartridge is 254 mm (1 in 10 in), 6 grooves, Ø lands = 7.00 mm, Ø grooves = 7.19 mm, land width = 2.79 mm and the primer type is large rifle.
According to the official C.I.P. guidelines the .284 Winchester case can handle up to 440 MPa (63,816 psi) piezo pressure. In C.I.P. regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers.
The SAAMI pressure limit for the .284 Winchester is set at 56,000 PSI, piezo pressure.
When the cartridge over all length is maintained, deeper-seating is necessary with long heavier bullets. This reduces usable powder capacity and hence performance compared to longer cartridges like the 280 Remington.
The American .280 Remington cartridge is probably the closest ballistic twin of the .284 Winchester. When compared to the .284 Winchester the .280 Remington has a slightly different maximum allowed chamber pressure and case capacity.
Read more about this topic: .284 Winchester
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