Cartridges with the same/similar OAL as 280 British for AR12.5?
Hi everyone. I was wondering what cartridges have the same (or basically similar) OAL as the 280 British. I am particularly interested in cartridges with an OAL between 2.45 and 2.60 that have an "auto-rim". I am thinking up a project utilizing an auto-loading rifle cartridge and the 280 looked like a good starting point, but I would love some options. The reason is that I'm collaborating with an engineer and a machinist to make an AR that is bigger than an AR15, but smaller than an ar10 and thus need something longer than the .223 family but shorter than the .308 family.
thanks
Hi everyone. I was wondering what cartridges have the same (or basically similar) OAL as the 280 British. I am particularly interested in cartridges with an OAL between 2.45 and 2.60 that have an "auto-rim". I am thinking up a project utilizing an auto-loading rifle cartridge and the 280 looked like a good starting point, but I would love some options. The reason is that I'm collaborating with an engineer and a machinist to make an AR that is bigger than an AR15, but smaller than an ar10 and thus need something longer than the .223 family but shorter than the .308 family.
thanks
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