Converting Sig 277 Fury Hybrid Brass to calibers that make sense.

An introducing to forthcoming series on maximizing the performance of the this future technology.

Walter has been very busy in the workshop experimenting with converting Sig 277 Fury Brass, and he thought bowlers would be interested in the philosophy behind it. First, we must do an introduction to the Sig 277 Fury and why it sucks in its current form but has great potential for reloading. Sig 277 Fury was developed as part of the NGSW (Next Generation Squad Weapon) to be shot out of the Sig Spear. The condensed version is that the Army wanted a new platform that could get a penetrating projectile going fast enough to crack the latest current and future body armor while still being portable. The smallest they could get with this projectile was in 277 caliber. It was designed to punch through the man in black pajamas body armor at 200 yards and a little more. The brass in Washington were not concerned with external ballistics, and the 277 Fury relies on outdated cartridge and bullet design but futuristic metals to make a case that could handle the necessary pressure to get a 130-grain bullet going over 3000 FPS in an AR10 mag. 

It's a specific tool to do something that has zero cross-over into the commercial world. The gun is heavy, not accurate, and recoils like a motherfucker. The bullet, with a comparatively low BC compared to other modern projectiles, falls past 500 yards with little of the performance gains from all of that pressure and wear on a platform, translating to external and terminal performance downrange.  The hybrid case design, however, is 100% the way of the future.

A few months ago, out at Garand Thumbs, Walter and Donny picked up a few hundred rounds of brass from the ground and stashed them for a rainy day. Originally, Walter planned on chambering a bolt gun in the caliber for use as a short but potent hunting rifle. One look at the ballistics, and Walter realized that the performance wouldn't be worth the noise, so Walt started converting the brass to better calibers for his needs. 

Shortened brass ready for resizing.

The process of converting and sizing 277 Fury to 8.6 Blackout.

His ethos is that instead of throwing an inefficient bowling ball at super high speeds,  Walter plans on using that potential of pressure and throwing very efficient bowling balls at moderate speeds, specifically 308 and 8.6 Blackout. So far, the results have been mind expanding,  with Walter's beloved 18-inch 308 getting a 212 Hornady ELDX going at 2448 FPS, carrying enough energy to kill an elk out to 600 yards, and dropping below the speed of sound just before 1300 yards. More info and testing to come but here’s a start. The political shirts are finished and will ship next week!