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 Post subject: LW Polygonal barrels
PostPosted: Mon Dec 02, 2019 6:41 pm 
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Joined: Mon May 29, 2017 4:47 pm
Posts: 82
Location: Pinehurst, NS.
Hi, I'm asking if a LW polygonal barrel beneficial on a sub 500fps rifle? Would a conventional barrel be more suitable?

Tia, Ken

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 Post subject: Re: LW Polygonal barrels
PostPosted: Mon Dec 02, 2019 7:49 pm 
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Location: Kingston, ON
I don't see why not. The Daisy 853C used for eons by our Cadet core had a LW barrel didn't it?
I

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 Post subject: Re: LW Polygonal barrels
PostPosted: Mon Dec 02, 2019 7:56 pm 
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Joined: Tue Feb 18, 2014 7:24 pm
Posts: 684
Location: Dowling ,ontario
I can’t answer if it is better or worse at under 500 fps , but I can add this. I just finished fitting one to an Evanix Rainstorm II for one of the forum members and it shoots lights out . I’ve done the standard LW barrel before and they shot equally well. Having the crown and leade cut will have an effect on accuracy also . I do think the 1:17.7” twist rate Lothar Walther use is better suited in .177 than .22 and .25 calibers

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 Post subject: Re: LW Polygonal barrels
PostPosted: Tue Dec 03, 2019 2:00 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 6084
Location: P.G. B.C.
In thinking bullet lengths, a 17.7" twist would work fine in .22 and .25 for conicals, up to 30gr. in .22 and quite likely
50gr. in .25.
Waisted pellets could use much slower twists, seems to me.

The standard rate of twist for .22 Short barrels, was 24". That was for a 29gr. conical at 1,100fps.
The standard rate of twist for .22 Long Rifle HP's and solids is 16", for velocities 1,080fps to 1,400+fps.

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 Post subject: Re: LW Polygonal barrels
PostPosted: Tue Dec 03, 2019 9:37 pm 
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Location: P.G. B.C.
Bsterne should have a handle on twists and what's required for waisted pellets and bullet.

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 Post subject: Re: LW Polygonal barrels
PostPosted: Sun Dec 08, 2019 3:17 pm 
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Posts: 1278
Location: United States
I have not tried it but my assumption is it would work better. The poly should seal better and have less friction to net more of what little power you have. Plus many guns like Crosman have awful barrels that by design cost you power, so you'd net that lost power. The next question is are you using the choke or not? Lothar are choked which is a huge bennie imo, but that choke also sucks some power so it may be an issue in a <500 gun. Not that the following story applies directly to a pellet, but I gave some Aguila Colibri 22LR ammo to a friend who had an Anchutz and the bullet stuck in the choke. The Colibri are slower than your <500 pellet and much more difficult to force thru a choke, but it's an example. I do not believe it would stick in a pellet gun but may take a chunk of velocity which may be random depending the pellet. So I picturing one comes out at 450, the next 420 etc. I'm guessing here, just saying I believe it's possible and the heavier the pell the worse it'll get. Like if you shot Baracuda pellets I'd bet $ it'll do that. A choke is way worth it and imo "the" thing to have, but only if you have the power to avoid the above probs and I simply don't know what that min power/velocity is.
I'd HATE to cut the choke off so if I were in your shoes I'd make it with the choke, and if that's a fail I'd make the gun full power, or save the barrel for a full power gun, or sell it to someone w/ a full power. Absolute last resort; cut the choke off. If you plan on not using the choke from the start then I'd save the choke end + as much barrel as you can so you/someone can use it on a pistol. The barrels are like 24" so you could use say 16" for your rifle and someone out there will gladly buy the remaining 8" choked end.
Since a <500 gun doesn't need 16" of barrel you could cut more off I spoze. Maybe make a deal w/ someone in advance, including inches, b4 you cut it. I'd say 50/50 on cost since the choked end is more valuable. Just some thoughts, fyi...


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