Home Forums Hunting & Shooting Ask The Gunwriters The ancient 277-03 rises

The military has chosen the .277 bore (6.8mm) for its new squad rifle and machine gun. That is why SIG, that has the contract to supply 9mm pistols, developed the 277 Fury.

These contracts are worth millions perhaps billions of dollars. Look for many new developments in all things for the .277 bore.

Interestingly, SIG chose a 140 grain bullet at, fanfare, 3000!

Many years ago Brian Litz wrote an article on “scaling” in which he described the factors that he considered in the design to optimize modern high BC bullets. He mentioned both the 6.5 and 7mm with the 6.5 being just a little small and the 7 as being a just a little big. He considered bullet weight and recoil. So, I wrote to him twice to suggest the obvious, that the .277 would be optimal. He never responded.

Perhaps the engineers at WW made a great decision when they designed the 270 Win!

Yes, Sig is running .277 at 80,000 PSI and with the ability to swap in new barrels, 'cause you're gonna want to. The history of how our military chooses things would leave one to believe they chose .277 just to be different.

Gays, trannies, in the military now this😂

Yeah, just what we need. (sarcasm)


" Back when ", I was running 140 HBTSP at 3000 fps, Surplus 4831 -- long case life.
Not much new. NOW we have new/better powders to BOOT.


Jerry

Hope they do give the 270’s some new life. Although my old ones work fine too.

A 277 140 @ 3k with 80k psi.

Yep, you are going to need to change those barrels.

Actually it was a .277x'03. Same daddy as the '06.

Great minds!

Now that's funny--and this is coming from a 270W loony.........

Jeez, I can do that with RL26 and a 150 grainer and still stay under 65K..........I think........

Well the claim of 140’s @ 3000 is out of a 16”, yes SIXTEEN inch barrel.

That’d be a slayer in an AR15 framed rifle.

Yes the 16 inch barrel is the difference. I run 130s all day long at damn near 3100 out of a 22 inch barrel but increase that to 140 and it's barely 3000, if that. Now whack 6 inches off that barrel and it's barely 2800. So Sig came up with this super strong case and I'm guessing "WUNDER POWDER" and it's back over 3000. That's smoking for a 16" barrel.

No you can't not in s 308 sized case and a 16" barrel

Is it even 308 size?

The late Homer Powley showed that barrel wear is caused by flame cutting which, in turn, increases with pressure. This is why barrels wear out from the chamber on. At 80,000 psi, barrels won't last long.

Who needs a 16" barrel anyway in a hunting rifle? As for military rifle clones, like the AR15 is a clone of the M16, I imagine that special 80,000 psi ammo will cost A LOT more than .223/5.56mm.

Same length, but the shoulder is further forward, and of course a sharper angle, giving it more capacity.

Not sure I care what the US military does or “thinks”... the fact remains, the 270 Win is The Western Big Game Cartridge. A perfect balance of power, trajectory, recoil, and performance. In North America and worldwide.

I vote for expanding bullets, too.

This is going to be great.