Hopefully 1:16 instead of the old choked 1:17.7
What’s the twist rate on the slug .22 23.5” LW barrel?
- Thread starter JamesD.
- Start date
As far as I know, nobody knows. AF hasnt posted official numbers, and I dont think they ever will. Might have to call/email them unfortunately. I cant believe there are still companies being run like this with little to no marketing or product info or research. Maybe I can get some consulting work lol.
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What about what the land and grove measurements? I wouldn’t be surprised if they went straight up 22lr barrel.
As a matter of fact I don’t understand why airgun barrels don’t adopt the .22 lr pattern all together. Sure they can play with twist rates but there’s zero reason why airgun barrels are anywhere from .216 through .224. Frustrating to say the least.
I have used Brownell’s .22lr red man liners in a few rifles with great success with EunJin pellets, RWS slugs ( Krale used to carry them) as well as cast bullets .
The new rage in slugs are the 41 grain boat tails now available from a few manufacturers. Well guess what, they look almost identical to what precision timbre shooters have been using for years. Years ago Bob Sterne designed some cast bullets with driving bands and a rebated boat tail. Again this has all been done before.
Sorry about the rant.here’s what LW has for a 1:16 barrel listed in .22
As a matter of fact I don’t understand why airgun barrels don’t adopt the .22 lr pattern all together. Sure they can play with twist rates but there’s zero reason why airgun barrels are anywhere from .216 through .224. Frustrating to say the least.
I have used Brownell’s .22lr red man liners in a few rifles with great success with EunJin pellets, RWS slugs ( Krale used to carry them) as well as cast bullets .
The new rage in slugs are the 41 grain boat tails now available from a few manufacturers. Well guess what, they look almost identical to what precision timbre shooters have been using for years. Years ago Bob Sterne designed some cast bullets with driving bands and a rebated boat tail. Again this has all been done before.
Sorry about the rant.here’s what LW has for a 1:16 barrel listed in .22
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The Sinner .223 airgun always had the LW .22lr barrel with 16 inch twist and indeed i shoot it with the RWS .22lr 41 grain slug at the same speed as .22lr firearm.
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They used to be sold at Krale. They aren’t listed anymore and I haven’t seen them in stock for quite some time. Too bad they aren’t real good quality although pretty expensive once you factor in shipping. I still have a bit of a stash but looks like when I run out I’ll be SOL.
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From the length of the barrel, it looks like they just cut off the choke and recrowned and threaded it so, probably a 17.7 twist still.
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Yup I call Rachel at airforce intentional .. she has no knowledge about no 1-16 Twist barrel aviable..
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That’s lame on their part. They know everyone wants 40’s stabilized from their airguns to directly compare with RF. I lapped my choke out and it shoots griffin 32g RBT slugs under 1/2 at 100 all day at 980 if tethered to a reg. I see groups open up if I go 34-36. I won’t even bother with anything over 32. No matter how fast I send 32 seems to be the limit for 1:17.7.
A 28” 1:16 no choke or minimal constriction with appropriate L&G for pure lead 40’s would be a dream at this point.
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Corbin will sell you their 1-15.5 liner but you still need to carbon sleve it n do the bushings n machine the lead in..
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The last option will be the 28" LW MORA barrel that is 1-16 some machining needed to .. but i been looking to buy one but there is none aviable to purchase alone anywhere..
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I see this question asked many times. If you physically have a rifled barrel and want to know the rate of rifling, simply use a cleaning rod with a tightly inserted wad and run it into the barrel. Then index the rotational position of the rod with a marker. Next withdraw the rod until the inex mark returns to original position, one revolution. Then measure the distance the rod traveled to make that revolution. That distance is the rifling rate. Simple.
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No there is another option coming in a few months. This is from another recent discussion.
[IMG alt="thammer"]https://www.airgunnation.com/data/avatars/s/1/1450.jpg?1654695132[/IMG]
AirForce Launches Exclusive Condor Slug Barrel Rifles in .22 & .25 Caliber
[IMG alt="thammer"]https://www.airgunnation.com/data/avatars/s/1/1450.jpg?1654695132[/IMG]
thammer
Member
Drop in hammerforged correct twist rate barrels are on the way. 22-30 with 357 and big bore in development from me.
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thammer said you will have to swap or purchase your own barrel bushings. These are replacement barrels for Airforce guns.
[/HEADING]
1-16 or 1-18 for 22 1-20 for .25 and 1-26 for .30.
All 3 groove for reduced friction and no distortion.
[/HEADING]
[HEADING=3]thammer
Member
1-16 or 1-18 for 22 1-20 for .25 and 1-26 for .30.
All 3 groove for reduced friction and no distortion.
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Your recommendation should not be so rigid. I have a 1-18 in .25 and it works well for both slugs and heavy pellets.. The correct twist rate depends on the projectile' shape, velocity and the cross sectional density (length) not the caliber. This information has been known for about 200 years. Google is your friend. When it comes to air guns. It is very important that spin stabilization does not compete with the drag stabilization of the Diabolo pellet shape. If it does the pellet will exhibit spireling.
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Pellets are not drag stabilized and never have been. They are stabilized by the lateral moments about the CG produced by the flare, not the drag, which produces essentially zero moment about the CG. https://www.airgunnation.com/threads/aerodynamic-stability-of-pellets.1276895/
Spiralling is caused by a combination of high pellet drag and too high a twist rate for long range. The optimum twist rates for long ranges are much less than they are for short ranges. You need to aim for an average gyroscopic stability factor of between 2 and 3 for pellets over the entire trajectory, hence the range dependency.
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What recommendation, I am not recommending anything Steve. As it says thammer will be making some barrels for Airforce guns. Some people have been wanting no choke options some people won't. This is just an option that will become available in a few months for those people looking for such a thing. I think it will be popular.
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Listen i took a old 18 inch .22 cal Airforce Condor Barrel that is 1-17.7 or close too...I cut off the choke making it 17inchs and hand lead lapped...Its shoots a 39 grain spire point cast slug very well at 1050 fps..It will stablize some 46 grain lyman molds slugs too but not nearly as accurate...
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