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BGReed--There is no standard established for the bore sizes and cartridge dimensions, for what is called 4 bores. The bores range from .935 up to 1.025. And the base sizes are all over the place too.I would like to get some info from him also. I am starting to build 4 bore brass from 20 mm cases and want to work with others,to get a size somewhat standardized, for all new ones. Two others here need cases for the Tula pump 4 bore shot guns they have.I will post a picture of a 4 bore case I just completed, this weekend, along with dimensions.Ed. |