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"T3PRanch"How many grooves on the outside Michael? I suppose it would have been better stated "similar but improved process"!

Thurmond
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My liner has a 1:30 twist. The original SmoothTwist has no visible grooves or rifling but rather the last 3 or 4 inches has been pressed, squeezed, & twisted to what would equate to about 1:50 (if there were actual grooves or rifling to measure).
 
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The reason I ask about the number of grooves on the Smooth Twist-X barrel liner is I am trying to determine if the bore is pentagonal, hexagonal, octagonal etc.
You have one to look at and I don't is why I am asking.

Edit: Mat Dubber answered the question in his Crown review video. The barrel liner has a pentagonal bore.

Thurmond
 
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Steve at AEAC:
Any update on the swamp problem (that nasty 10 inches of rain in a couple days). Has it started to drain enough to start testing?

By the way, from a boy in the desert, looking at the swamp you showed just screams nasty stuff like snakes and such. Be safe out there!

Don't want you to get hurt or anything like that. (It might slow down your reviews or something like that :) )

 
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"Saltlake58"Steve at AEAC:
Any update on the swamp problem (that nasty 10 inches of rain in a couple days). Has it started to drain enough to start testing?

By the way, from a boy in the desert, looking at the swamp you showed just screams nasty stuff like snakes and such. Be safe out there!

Don't want you to get hurt or anything like that. (It might slow down your reviews or something like that :) )

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I think Steve will be "Well equipped" for snakes or pretty near any other varmint as well! lol

Thurmond
 
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"Michael"
"T3PRanch"How many grooves on the outside Michael? I suppose it would have been better stated "similar but improved process"!

Thurmond
Click to expand...

My liner has a 1:30 twist. The original SmoothTwist has no visible grooves or rifling but rather the last 3 or 4 inches has been pressed, squeezed, & twisted to what would equate to about 1:50 (if there were actual grooves or rifling to measure).
Click to expand...
Michael,
The original ST barrel does have quite obvious rifling those last couple of inches. With the muzzle sleeve unscrewed and removed the grooves on the outside are clearly shown.
The rifling is squeezed in to show on the inside in the barrel as 5 lands. The twist rate is nominally 1:16". There is no "twisting" of the metal. I alerted Fredrik to the results of Dan Brown and my studies which showed that shot pellets will not emerge with spin rates commensurate to the 1:16" rifling. Fredrik then duplicated my tests to his own satisfaction. The outcome was that, depending upon pellet weight, velocity and calibre, the pellets may have spin rates from approx 1: 40" to 1: 160" (one of Dan's). Shot pellets do not show the rifling, but rather show 5 "flats" swaged as the pellets skate though the rifling. ... Regards, Harry.

 
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"Yrrah"
"Michael"
"T3PRanch"How many grooves on the outside Michael? I suppose it would have been better stated "similar but improved process"!

Thurmond
Click to expand...

My liner has a 1:30 twist. The original SmoothTwist has no visible grooves or rifling but rather the last 3 or 4 inches has been pressed, squeezed, & twisted to what would equate to about 1:50 (if there were actual grooves or rifling to measure).
Click to expand...
Michael,
The original ST barrel does have quite obvious rifling those last couple of inches. With the muzzle sleeve unscrewed and removed the grooves on the outside are clearly shown.
The rifling is squeezed in to show on the inside in the barrel as 5 lands. The twist rate is nominally 1:16". There is no "twisting" of the metal. I alerted Fredrik to the results of Dan Brown and my studies which showed that shot pellets will not emerge with spin rates commensurate to the 1:16" rifling. Fredrik then duplicated my tests to his own satisfaction. The outcome was that, depending upon pellet weight, velocity and calibre, the pellets may have spin rates from approx 1: 40" to 1: 160" (one of Dan's). Shot pellets do not show the rifling, but rather show 5 "flats" swaged as the pellets skate though the rifling. ... Regards, Harry.


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Harry! Glad to see you again. Haven't heard from you in a while and I was beginning to fear the worst.

I removed the muzzle adapter from an old ST barrel 
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and although I don't see any rifling on the outside, I do some some similarities on the inside
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To my inexperienced eyes it looks like there are two different materials; almost like a "permanent sleeve" embedded inside a barrel.

I reached out to FX to see is they are willing to elaborate on the differences between the rifling of the ST & STX. Hopefully they respond, but it may be a trade secret that they keep to themselves.

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Michael, on the old ST barrel there is a sleeve over the last couple of inches where the barrel has been turned down thinner to allow for the "rifling" to be impressed into that last few inches. ( The muzzle cap is screwed onto that sleeve ).
If you look carefully or use your finger nail, slid along back from the muzzle, you will locate the join. Unscrew that sleeve and the rifling on the outside of those couple of inches will be revealed.
Now with a light reflected through the barrel from the breech, look in the muzzle with a magnifier and you will see the inner rifling in those last couple of inches.
I have posted very clear pics of all this on The Yellow forum back years ago but unfortunately they won't show until and when and if I pay for the new Photobucket arrangement.

The new XST barrel liners are thin enough to have the rifling impressed and for the full length. The process for doing that is not yet revealed ... regards, Harry.

 
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Turned down - that's the word i was looking for. 

FX replied back & confirmed that the actual rifling of the STX is similar to the ST. However the machines used to make the STX are very different & capable of a extremely accurate twist rates along the entire length of the barrel (liner).

Thurmond you were right, there is no "twisting" involved, only "pressing". And as Harry pointed out the original ST rifling can be seen if you remove the muzzle cap that covers the rifling on the end of the barrel.
 
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"Saltlake58"AEAC - Steve - 
​How much rain did you get behind Harvey? Looks like from the maps your range didn't get the huge dumpings of rain that Houston got, but did the water rise, again?
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Houston is a disaster and they're in real trouble. Here in Florida Harvey's been pulling a lot of deep tropical moisture up our way which made for a soupy weekend. We got 1.5" on Saturday, 1.75" yesterday, have the same forecast today. It's been enough to flood the field and shut me down again... so frustrating. Here's some pics from us trying to film the Stealth RDW this weekend. It didn't work out and we had to bail.

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