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277 Sig Fury

New drawing Coming

In 2019, Sig introduced the 277 Sig Fury, a new-generation cartridge. As adopted, it uses a three-piece case designed to handle 80,000 psi, for use in special guns that are also designed to handle such high pressure. Dimensionally, the case is very similar to a 7.62 NATO case (308 Winchester) necked down to 27-caliber. This is no accident; this round is intended for chambering in guns that are also chambered for the 7.62 NATO cartridge.

Owing to the pressure used, the 277 Sig Fury with a 16-inch barrel can deliver energy on par with a 7.62 NATO using a 22-inch barrel and do so with significantly less recoil. One must suspect muzzle blast will be nothing less than monumental but that is mitigated by the inclusion of suppressors in the gun designs. It seems unlikely this cartridge will find significant application in the sporting field anytime soon.


This round reminds me of the myriad attempts manufacturers have made to eliminate the case entirely or substitute something else for brass over the past century and a half of the cartridge gun, none of which led to anything. Time will tell if this will be different.

One thing is for sure: usefully accurate life with a conventional, unlined steel barrel would be extremely limited. Chrome lining would mitigate that problem while adding to cost and reducing accuracy. Including a stellite-liner for the beginning of the barrel would go much further toward improving barrel life but at a cost few sportsmen would tolerate.


The text associated with the cartridge description reflects opinions and conclusions of the author, M.L. (Mic) McPherson. Lee Precision and its employees do not necessarily either agree or disagree with any of his comments. We present these with due deference to his recognized expertise in the firearms field. His acumen extends to handloading and all aspects of ballistics - internal, external, and terminal.
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