There are three .35 caliber Rigby cartridges. Two of them are rimmed, since they were originally intended for double rifles, the .400/.350 and the .350 No. 2, which have identical cases but use different bullet weights. The .400/.350 uses a 310 grain bullet and the .350 No. 2 a 225 grain bullet. Then there is the .350 Rigby Magnum, which uses a rimlesss case and a 225 grain bullet. Rigby offeered all three as bolt action rifles, the first two requiring the special slanted magazine Magnum length action to accomodate the rims and the third an ordinary Magnum action. I have two and am expecting to acquire the third, the .400/.350 in the not-too-distant future.
The case for the .400/.350 and the .350 No. 2 can be formed from 9.3X74R brass, while the .350 Magnum case requires a rimmed magnum case with the rim removed and an extractor groove cut into the case head.
This is the special slant box magazine single square bridge Magnum action with a stepped receiver ring built especially for Rigby by Oberndorf.
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This is my .350 Rigby Magnum, built using all original Rigby parts, except for the barrel, which is a copy of the original.
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This is my .350 No. 2, still under construction, made entirely of original Rigby parts, including the barrel.
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