High-Strength Super Alloy BCG?

[lysander]

How could you possibly know if C158 was perfectly adequate for a new miniaturized .308 design?

We can know if, or if not, C158 is adequate, because we know:

1) the loads produced by .308 Winchester
2) the strength of Carpenter 158 steel, and
3) we can get a real good estimate of how much steel is loaded in the bolt and extension based on its size.

[Todd.K]

I think perhaps you missed the point. Some people were not aware that it was not an AR-15 bolt being discussed.

It’s also a brand new design using whatever material Ruger decided to use, so nobody makes a C158 bolt for it, adequate or not.

[OutofBatt3ry]

Investment Cast!

I had a pot-metal p85, and currently own a sad P95 with the plastic/fiberglass concoction of a frame. Meh. I have a soft spot for it, Ruger was my first gun.

I know nothing about .308 AR's but I do enjoy a SCAR-17

[kirkland]

Pot metal aka Chinesium? LOL!

[bfoosh006]

Aermet 100 ?

Both C158 and Aremet 100 are produced by a Carpenter companies.

Bill Geissle has this on his webpage... ( bare with me )

"Since Geissele wanted to take it to the next level, our engineers worked directly with the Carpenter Steel metallurgists in Reading PA, to produce a special type of material known as Carpenter 158+. This material is cleaner with less impurities, ultimately making it stronger and more consistent. We did not stop there, we decided to forge the bolt. Using the same process used to produce upper and lower receivers, a forged bolt manipulates the grain structure of the metal and yields a bolt capable of 5 times the life of a mil-spec bolt."

Mr. Geissele also mentions here about a "C158+" material used .. right around the 15:00 mark.

https://www.youtube.com/watch?v=hxjEdj8Z5kE

I am very curious what material Geissele and Ruger are actually using.

For that matter... what is the SIG XM5 using for its bolt material ?

[BufordTJustice]

The only bolts Ive found to actually live up to their claims are the LMT enhanced and the KAC E3 bolts which are both using Aermet steel. Unless Ruger is using the same materials I highly doubt its going to be anything special.

Vicious, is the original E3 bolt using Aermet/A100? I have heard that the E3.2 bolt is, but no info on the original.


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[DwayneZ]

There's a few flavors of steel like 9310 that are more "fracture resistant". My guess it's one of those.

[Defaultmp3]

"the bolt and barrel extensions are machined from a special alloy with a high nickel content for extra strength and durability"

Source: https://www.gunsamerica.com/digest/r...ackage-review/

[Todd.K]

C158 and 9310 are both a special alloy with a high nickel content too, compared to normal steel grades. Something like A100 does have more nickel but it’s really a cobalt alloy.

Still no idea if it’s really exotic or marketing.

[constructor]

The bolt on the far right is .800" OD, just to the left is a bolt with a .750OD. Both can handle cartridges with a 308 diameter bolt face, both bolts are made from 9310 VAC ARC. I made those from 2009-2017 for wildcats with a 308 diameter case and use in an AR15(6BRX, 6mm Dasher and similar), no one has ever broken one.
I've never seen the Ruger bolt so I don't know the size or shape but that will give you an idea what 9310 will handle.
Attachment 69548