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[drago78]

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[Bob Hostetter]

Use any of the 4140 series but go with a hard chrome bore.

[Junkie]

I'm jealous of the gun, trying to find one right now but they're hens teeth.

From what I've heard, nitride (done well) is better than hard chrome in pretty much every way. It's extremely corrosion resistant - I shot a few hundred rounds of 7N6 through my Ballistic Advantage barrel on an AR and then let it sit for a week, after which there were no signs of corrosion.

I'm seeing more 4150 around now, which should last a tiny bit longer, but in the case of a nitrided barrel it isn't too important.

4140CM sounds like a redundant phrase - 41xx are all chromoly. As far as I can tell the R means it's high sulfur content which makes machining easier. That might let the rifling be a little better cut and therefore a hair more accurate but I doubt it matters on a gun like that.

Additionally, when they say carbon steel with nitride they mean chromoly with nitride - 4140 is by definition chromoly, and mild steel barrels aren't very common as far as I can tell. What they mean is non-stainless.

I'd like to hear what it costs and how well it shoots.

[Bob Hostetter]

Hard chrome in the bore provides more protection then just about anything especially when using corrosive ammo. It is why the military likes it so much on their rifles. There is a company called TechPlate in Orange County that is one of the top companies around when it come to firearms coatings, ask them.

[kcstott]

There are only two typical materials used in high pressure barrels. 4140 & 416 stainless. That's it, material type doesn't make a barrel more or less accurate.

As for barrel treatments, chrome lining is about the best you can do for corrosion protection but it's also the worst you can do to accuracy.

If it were me I'd get a Shilen barrel and if I really had a hair up my butt I'd get it nitrided.

[kcstott]

It's just iPhone mid spelling. Shilen barrels

As for nitriding be more corrosion resistant I would disagree. A nitrided surface will still rust. Even melonite will rust.

The thing is if you are taking care of your weapon corrosion is not an issue.

[Bob Hostetter]

https://www.Techplate.com

714-634-9254
info@techplate.com

[Bob Hostetter]

The best twist rate is based largely on the bullet weight within a specific caliber or bullet diameter. So to tell you what twist is 'Best' would require you to specific what bullet you are going to use.

[kcstott]

I did try to find a barrel on the Shilen website but I don't see 1:9.5 twist and for .30 cal

Every metal will rust sooner or later but chrome lined is just not that consistent compared with nitride plus accuracy is better.
The original barrel is 1:9.5 twist ration, would be a good idea to go with 1:9? Any accuracy gain from a bit faster twist ratio?

Thank you for your time

Well you are not looking for .30 cal, you need to be looking for .303 and they have a 7.65mm barrel with a 1:10 twist and if you think .5" of twist will create a problem you need to go buy a $600 Romaininan barrel

[Junkie]

It's just iPhone mid spelling. Shilen barrels

As for nitriding be more corrosion resistant I would disagree. A nitrided surface will still rust. Even melonite will rust.

The thing is if you are taking care of your weapon corrosion is not an issue.

Nitride melonite, and QPQ are essentially synonymous, right?

I have a 5.45 AR with a Ballistic Advantage barrel, 4150CMV, QPQ. I put a few hundred rounds of 7N6 through it and then let it sit for a week. No signs of corrosion. It's tough stuff.

[ar15barrels]

Please correct me if I'm wrong. From what I read the nitride salt treatment is more resistant to corrosion compare with the old chrome lining.

For processing a single barrel like you are looking to do, Melonite or any of the similar nitriding processes will be far cheaper than having someone hard chrome a single barrel due to the chrome process needing to have the barrel etched to make room for chrome.

[kcstott]

I will mostly using surplus ammo that I believe is 147gr and occasionally the 180 Winchester. The original barrel is 16" long with 1:9.5 twist ration but I want to get the new barrel in 18" and I was wondering if is a good idea to go with a bit faster twist for more accuracy being 2" longer then the original???

I am trying to have this done correctly and get the most accuracy out of this rifle possible

barrel length and twist rate are completely irrelevant to each other for the most part in any Rifle length barrel.

if your barrel is 16" or longer stick with the standard twist rate that is for your bullet length not weight. I can't say on the 7.62X54R but being that it's ballistics are near the .308 and bullet weights are near the same (length should be checked) a 1:10 twist would work just fine.

Just be sure when you order a barrel for a .311" bullet you are getting a .311" bore
there was a guy ior maybe still is a guy selling barrels for PSL's and he has used a .308 blank, That is not a good idea.

[ar15barrels]

I will mostly using surplus ammo that I believe is 147gr and occasionally the 180 Winchester. The original barrel is 16" long with 1:9.5 twist ration but I want to get the new barrel in 18" and I was wondering if is a good idea to go with a bit faster twist for more accuracy being 2" longer then the original???

I am trying to have this done correctly and get the most accuracy out of this rifle possible

Your best accuracy comes with the slowest twist that will properly stabilize your bullet of choice at the length you cut the barrel and in the weather conditions you shoot in.
So, for an 18" barrel, 11" twist is about perfect for the 180's while a 13" would be about perfect for the 147's.

[ar15barrels]

barrel length and twist rate are completely irrelevant to each other for the most part in any Rifle length barrel.

I'm going to strongly disagree.
The twist rate effects what bullets you can shoot which directly effects how far you can shoot accurately.

Using 223 as an example, a 16" 1:9 twist barrel will generally not stabilize 75-77gr bullets while a 20" 1:9 barrel usually will stabilize 75-77gr bullets.
Moving from 68-69gr to 75-77gr bullets is a significant advantage beyond 400yds.

[kcstott]

Randall is up in Van Nuys and I'm down in SD Take your pick

I've got a shilen .311 1-10 blank in the lathe as i type, will be turning a PSL from a blank chamber and population next week

I'm going to strongly disagree.
The twist rate effects what bullets you can shoot which directly effects how far you can shoot accurately.

Using 223 as an example, a 16" 1:9 twist barrel will generally not stabilize 75-77gr bullets while a 20" 1:9 barrel usually will stabilize 75-77gr bullets.
Moving from 68-69gr to 75-77gr bullets is a significant advantage beyond 400yds.

Thats where you leave me in the dust, I wouldn't expect a 1-9 to stabilize anything heavier then a 67 grain
I'd bump to a 1-7 for 70 grain and up.