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msalm
Reply with quote  #9 
I've used quite a few Lothar Walther barrels on AR-15's and a few hunting rifles. I've never had one of their AR barrels NOT shoot 1/2 MOA or better, these were chambered and fit with barrel extensions at Lothar Walther in GA. I've also chambered a couple of their stainless barrels and it doesn't cut as well as 416R. I've read too where it is similar to (or is the same as) 17-4PH steel and from my understanding it is a better steel, but harder to work. The barrels threaded beautifully, but I had difficulty getting a real clean chamber on them, it looked as if it tore somewhat (kind of gummy, not hard). That said, after the chambering was completed and looked crappy (to my eye), all of one minute at 1000RPM and 400 grit paper on a dowel and it looked flawless. Shot very well too, that one was a 6.5 Grendel.
Clark
Reply with quote  #10 
I have been buying LW Chrome Moly barrels and Shilen select match stainless barrels from Brownells for 10 years.
I wish Brownells would carry a wider selection of bores and tapers of LW and a wider selection of tapers in Shilen select match.

I think that LW CM barrels shoot straight when hot, thanks to excellent stress relief.
I think that LW barrels are slow to Copper foul and fast to clean, thanks to excellent factory lapping.

The only problem I have ever had with LW is that they are so highly polished, the gimbal in the 4 jaw slipped. I can either rough up the shank or cut the thread relief slowly.
jthyttin
Reply with quote  #11 
LW makes a lot of different grade barrels and blanks. Cheapest ones are not lapped etc. I don't know what grades they offer in US.
Robert
Reply with quote  #12 
Quote:
Originally Posted by jthyttin
LW makes a lot of different grade barrels and blanks. Cheapest ones are not lapped etc. I don't know what grades they offer in US.


Hi,all

More important:

This is the answer I received directly from Gerd Walther:

For you in AISI, it is the 420 alloy.

I presume their supplier is Boehler Udderlohn in Austria.

R.G.C

The material we use is specialy made for us and we order not through a dealer, we order directly from the steel company here in Germany and Austria. We have the name in our house LW 50, the offical material name is X20Cr13 or if you like to look into the Stahlschl├╝ssel, it have the number 1.4021. The steel is in a special way straightened, controled and headtreadet for our product. We know about that it isn`t easy if you like to work by your self with the steel (specialy with the standart chamber reamers which available on the marked) here all have to be corect, the tool have to be sharp speed and feed have to be corectly and it have to be used a special metal cutting oil.


sleepygator
Reply with quote  #13 
AISI 420 is a Martensitic stainless commonly used in kitchen and surgical knives. It is not related to PH steels, requiring quenching from transformation to increase material condition. It is regarded as tough and stringy when machining. Steels with this characteristic often require special cutter geometry to achieve optimal results.
Rust
Reply with quote  #14 
Well, I doubt I'll ever switch from the LW50 match grade barrels for my 6.5 X 284, and kindly note I said "match grade". The biggest reason is that the first barrel was exceeptionally accurate and the second and third and subsequent barrels were at least as accurate.

The steel doesn't cut like 416R. First off, when chambering the speed needs to be around 250-300 rpm. The cutting fluid should be what LW recommends and failing that heavily sulferized. The barrel should be chambered in a through the headstock lathe and cutting oil pressure fed through the barrel. I have my own PTG reamer from Dave Kiff (great guy) and he uses M-42 tool steel which cuts the LWs pretty well but a careful hand on the feed is required. The barrels do thread and crown rather nicely though.

I had one or two nationally known accuracy smiths refuse to work with an LW barrel, but I found one that does basically perfect work, the last two barrels were chambered within .0004" of each other as near as we could tell. Reason being I have at least two chambered up at a time as 20+ round strings of 6.5 X 284 are hard on ANY barrel.

I will put the LW match grade barrels in the "best" catagory. There are other makers in that catagory, some of which I've had over the years. But the LW barrels, along with the exceptional smithing that went into my rifle have allowed me to win a couple of matches and believe me, I'm not that good. Sometimes it seems like an unfair advantage.

As always, the development of a truly good match rifle is an ongoing process.

A few painful (and expensive) lessons learned:

1. ALWAYS borescope the barrel before ANY work is done on it. If it is anything other than flawless, send it back. Any reputable maker will take a flawed barrel back. If they don't, find another barrel maker.

2. Regardless of the quality of the barrel, it will only shoot as well as the quality of the smithing that went into chambering and mounting it. Best barrel in the world will not achive it's potential for accuracy with bad work.

3. It's never seemed to make any difference whether the barrel was cut rifled or button rifled, a quality barrel shoots.
Clark
Reply with quote  #15 
I just chambered a 1300 taper Chrome Moly Lothar Walther barrel in 7mmMag. The rifle weights 8.25 pounds + scope.

I went to the range Saturday, and with 162 gr Hornady Interlocks, it averages 0.78" at 100 yards.

I continue to be happy with LW.
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