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The original production rifles by Roy Weatherby were built on commercial Mauser actions manufactured by FN, Brevex (magnum), and Mathieu (left hand). Weatherby would build a custom rifle from a customer's specifications for bespoke rifles, using any action the customer requested - provided the action was strong enough to tolerate the pressures for their desired cartridge.
The .257 Weatherby Magnum has a case capacity of 84 gr. of water (5.45 cm 3). Sources such as Lyman and Weatherby's pressure rating suggest maximum average pressure limit of 66,000 psi (4,600 bar). CIP limits the .257 Weatherby Magnum to a maximum average pressure of 4,400 bar (64,000 psi).
When first introduced by Smith & Wesson in 1935, it was known as the Registered Magnum. [citation needed] The model was essentially a custom-order revolver.Barrel lengths could be had in 1 ⁄ 4 inch (6.4 mm) increments from 3 + 1 ⁄ 2 to 8 + 3 ⁄ 4 inches (8.9 to 22.2 cm) inches in length.
As with other Weatherby Magnum cartridges, the 7mm Wby Mag design is based on the .300 Holland & Holland Magnum case. It is necked down to 7mm (.284) and features the trademark double radius shoulder. The case was blown out to eliminate the taper and shortened to feed from a standard length action like the .257 Wby Mag and the .270 Wby Mag.
From an 8.5 inch pistol barrel the 60 grain .256 Winchester factory load was advertised as having a MV of 2350 fps and ME of 735 ft. lbs. This was 250 fps faster and nearly twice as powerful as the .22 Remington Jet, a varmint cartridge for revolvers that was also based on a necked-down .357 Magnum case.
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The .270 Weatherby Magnum was the first belted magnum based on the .300 H&H Magnum to be developed by Roy Weatherby in 1943. [2] The cartridge is short enough to function in standard-length long actions with a brass length of 2.549" or 64.74mm and an overall length of about 3.295".
The Wildey employs a unique short-stroke gas operation which allows the pistol to be adapted to fire several high-pressure cartridges ranging from the 9mm Winchester Magnum to the .475 Wildey Magnum. Moore described the Wildey patented gas system as an "air-hydraulic piston powered by the firing gases through six small holes in the barrel.