Airgun Benchrest Barrel Question!

The other day I was checking out LWs web pages for air rifle blanks in caliber .177. Then I saw that they had both polygonal and stainless steel blanks as well as their "standard" special metal blend blanks as well as choked blanks.

I've heard that choked barrels should be the preferred kind, but what about polygonal? And what about their fouling rate, is it higher than for traditional rifling with lands and such?

Should one go for their "special metal" blanks or SS?

Anyone know which twist rate they use in air rifle blanks?
 
LW barrels

I`ve heard the poly are more accurate.A couple of years ago two guys using poly barrels on HW100`s won the 100meter competition in Europe coming in
1st and 2nd.I would talk to Jim Gaska at Marmot Militia.I bought a .630 .22 reg barrel from him and it is very accurate.Good luck,Mark Hagan
 
sepeteus said:
I'm very interested in about that barrel question.
That 22 cal Benchmark barrel which was 0mentioned... Is it specifically made airgun barrel, or in fact, rimfire barrel? I haven't heard about benchmark airgun barrels...


I have several LW barrels for my steyr LG110 and I'm pretty pleased on their performance; those tend to shoot better than steyr's original barrel.
Click to expand...

I have a LG110 FT, could you please expand a bit about what kind of barrels you have, and why you choosed them?
 
sgeorge said:
A few theories are out there based on McCoy's testing. All attempt to predict a stability coefficient based on a number of factors. None of those factors fully takes into account the shape of our pellets, weights or subsonic velocities, however, some of the work on the rimfire side is helping to possibly answer some of these questions.

So far, we have seen records with typical twist rates, 1-16/17 and others not so typical, 1-24/36. This might indicate that at the current 25m distance, most pellets, at legal power velocities, are stable.
Click to expand...

Hi Steve,

Did you receive the modified equation for predicting Sg I sent a while back.....just curious.

Landy
 
Landy,

Got it and is interesting. Will see if the calculation for .30 caliber works. Thanks.
 
sgeorge said:
So far, we have seen records with typical twist rates, 1-16/17 and others not so typical, 1-24/36. This might indicate that at the current 25m distance, most pellets, at legal power velocities, are stable.
Click to expand...

I am from the metric zone on the globe. What is the significance of 1-16/17 and 1-24/36? How many twists per X length?

And what is Sg? So many strange abbreviations to learn.
 
The "standard" 22 rf bbl twist is one full revolution in 16 [ or 16.5 ] INCHES !!! Please don't start introducing metric measurements !! hahahha Even though I worked on imported motorcycles and cars most of my life I still can't do metric without some thinking about it. :)

There are non-standard twists floating around. I have a couple of bbls I got from a inquisitive fellow. One is a 14.5t and the other is a 15.5t. The 15.5 shoots pretty good but I haven't spent enough time with it to really figure it out. I have a Suhl that is a 19t. It will shoot great when it's hot outside even out to 100 yds. The slower bullet rpm seems to lessen the vertical effect from cross winds. Once the weather cools off then you get wild flyers.
 
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cut rifled barrel

Dear friends
Has anyone ever used of cut rifled barrel on any PCP in BR shooting?
What superiority over LW polygon or 12 grove barrels?
 
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