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

Here's a couple good articles on the cartridge and Sig rifle.

https://www.gunsamerica.com/digest/277-sig-fury-demystified/

https://www.gunsamerica.com/digest/...ith-the-sig-cross-rifle-in-277-sig-fury/


And a photo of the rather complicated case:

https://www.americanrifleman.org/articles/2020/1/20/277-sig-fury-an-inside-look/

And despite the recent Ross Seyfried bashing, a good one:

https://www.gunsamerica.com/digest/ross-seyfried-busting-the-magnum-myth/

My primary thought was that there will be lots of attention given to developing.277 bullets and barrels.

Rick, I’d be good with anything and see what does develop. Not that us poor .277 guys are totally out of the picture anyhow!

They still seem to keep making meat and horns.

Besides, I thought you were switching to the 6.5 Creedmoor

My comments weren’t directed to you Rick, just general musing. Of all people, you know what the 270 Win is and isn’t.

80,000 psi out of 16” barrels? That’s gonna hurt. We’ll need a lot of ear plugs or muffs.

My thoughts, exactly.

I haven’t yet adjusted to these newfangled 60+K cartridges yet.

FC

Brad,
Didn’t even occur to me. Trust you are well. To bad you aren’t out hunting elk!
Best to you,
Rick

Seems ridiculous, why not just go 6.5 Creedmoor or 7-08 with a 20-22 inch barrel. Or better yet just stay with the 7.62..

80k is going to find the weak spots....

This. Sig is not using '06 brass.

I am waiting to see the GI platform they will run it on. Are they gonna scale back up to an AR 10 platform? And will half the "grunts" in our new all inclusive armed forces cry that the arm and munitions are just too heavy? And recoil too hard?

I’m a skeptic. Just don’t see it working as far as costs and practicality.

After watching the links, it makes more sense. GI contract is for belt fed machine guns. Nothing about replacing the venerable M16 platform.

I am correctly corrected....277-30 US 1903

I thot so but wasn’t positive.

That’s HARDLY a 308 W size case.


Jerry

The new round is for a 16" barreled belt fed machine gun

I'm guessing the reason for the 16" barrel is in order to run suppressors on them without being cumbersome

And, heat seeking bullets, that politician was talking about.

That would make sense.

I dunno squat about suppressors. Would 80K pressures be hard on ‘em?

FC

One can only assume, or rather it would be better to say hope, that the powers-to-be who are in charge of selecting new guns and new cartridges for the military, do their homework and come up with something good that will work. I have no idea what all goes into the process of developing such cartridges, but I do know this.......for about 25 years, the 270 was my cartridge of choice for whitetail deer and I killed several truckloads full with it, and although I have used other cartridges in recent years with good success, nothing killed a deer any better than the 270 did.

I never used it on anything bigger, but if I'm ever lucky enough to draw a Kentucky elk tag, I will use the same 270 that I bought over 40 years ago.

There are plans to issue the new Military Rifles with suppressors,otherwise muzzle blast from a 80,000 psi round would be horrific.

The whole project seems like they are chasing their tail,they need a 16 inch barrel because of the added length of the suppressor,which they need because of the high pressure which they need to get the necessary velocity from the short barrel.

Does anyone else see the absurdity of the thought process?

I have a Kimber Adirondack in 6.5 Creedmoor with a 18.5 inch barrel,the Hornady 120 grain GMX Superformance load gives me 2950 fps without a suppressor,and 2980 fps with one.
All of this at about 60,000 psi.

Since the difference in terminal effect between a 6.5mm 120 grain projectile and a 6.8mm 140 grain projectile is undectable.( I know because I've killed a bunch with both.)And the the BCs of the bullets are very close,what real world gain do they expect to see by inventing a new cartridge with a pressure that is going to be a mechanical nightmare with respect to a host of components.

The thing will be hell on barrels,as well as bolt and receiver components as well. They could use a 20 inch barrel in a 260 Remington with 130 grain bullets and do the same thing at 65000 psi. Because of the lower pressures, a really short suppressor that extends 4 inches beyond the muzzle and a couple of inches behind it would be as quiet as a full length suppressor on the high pressure 6.8.

If I being a Dentist and a rifle looney of the first order know all this stuff,why does anybody spending the money in the military not get it?

Just amazing.