This is from just published article which contradicts what you are saying. I assume Sig, like any other company, wants to make money and will do whatever drives that. That being said to original point whether only sig loads or not - this will drive new 277 tactical / target bulllets that can be used in other rounds. Tons of 6.8 whatever will eventually be sold once it rolls out. What do 6.5/7mm/30 all have in common that 270 (and 25) do not? Military background….
I am skeptical whether 6.5 version would be more popular or not as speculated in article. They said chose the 6.8 version because it can defeat any known battle armor which infers the 6.5 could not. Can't imagine the US public wanting a less capable round than what soldiers carrying
SAAMI approved a maximum chamber pressure of 80,000psi for the new .277 SIG Fury. First unveiled in late 2019, the cartridge is the result of SIG Sauer's participation in the Next Generation Squad Weapons (NGSW) military procurement solicitations.
www.gunsandammo.com
"I don't see too many folks shooting factory ammo in large quantity anytime soon, however, SIG Sauer will eventually make components and load data available so that handloaders can get in on the action. (Yes, SIG Sauer's hybrid cases for the .277 Fury are reloadable, which can't be said for other competitors in the NGSW bid for the U.S. Army contract.)
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Will there be additional cartridges planned for a "Fury family?" A representative with SIG Sauer told me, "Yes." There is no timeline yet, and that person wouldn't say what was next in line. I'll step out on a limb and predict that the next one will be a 6.5mm SIG Fury, and I'll bet that it will be more popular than the .277 SIG Fury proves to be! The .277 SIG Fury arrived to us first because it is simply a commercialization of what SIG Sauer has already been developing for the U.S. Army's NGSW requirements