New FX .25 SLUG liner now apparently 1:16 twist rate.

[Healthservices]

The queens in 6.36 are hard to push thru my 1:18 and thus in max power I barely was able to go to 860 fps. I ran out of them before getting a definite answer and never tried them in the new 1:16 700 mm liner. It was easier in my 800 mm to push to 900. I think in my 800 it grouped better with the 6.36 queen though. At the same time with the 800mm I got more whip and kick back. Harder to keep a steady trigger. I may stay with the 49.5 gr just to play and have some fun for a while. Messing with the 60 gr was hard work with the fx liners I had.


Allen.

 

[Healthservices]

Allen, thank you for sharing. That is AWESOME!! I doubt I will ever have that level of skill and opportunity to demonstrate it.

Have you tried the Queens in 6.36? They look like they would work very well.

You will be surprised at what you can do once you get the Altaros to work for you. Compared to the other slugs you will wonder why you even bothered with them. When you get the speed they like they are stable and buck the wind better than any other slug. So much so you will think you are cheating with them and have to hide the Altaros as somebody might find out how great they are.

Allen

 

[darknes]

so I did a test and measurement of my fx liner .25 and found that it has a hard Chok. the input diameter is exactly 6.35mm but the output is only 6.27mm. The choke starts exactly 120mm from the end of the barrel, at 63mm it begins to transition into a smaller diameter down to the mentioned 6.27mm. during the slug push-through test, these slugs are strongly scratched and even stretched. so this barrel is more suitable for pellets and not for slugs as claimed by the manufacturer. the ideal would be a barrel without Chok or one that will only have a soft Chok. slugs - with a bullet diameter of 6.35, a speed reduction of up to 40ms is caused depending on the length of the bullet, with a bullet diameter of 6.34 it is up to 20ms. therefore, I am thinking that I will try to take an 800mm liner and shorten it to 700mm, and that should make the Chok disappear and only the quality part of the barrel should remain.

 

[josh9465]

So the “new“ 1:16 is now discontinued. The latest version is back to 1:18 twist rate. What a disgrace.

 

[darknes]

So the “new“ 1:16 is now discontinued. The latest version is back to 1:18 twist rate. What a disgrace.

What?

 

[darknes]

maybe they should learn something about barrel making. and to think about ballistics, etc., for example personally for slugs I would like to see 1:7 maximum 1:12 bore pitch for .22, 1:16 is ideal for .25 ....... etc. as another do not use slugs at all chock maximum total soft chock and then it will work on 1

 

[josh9465]

What?

That’s direct from Utah Airguns and Topgun Airguns in CA. Looks like users are the R&D.

 

[bigHUN]

I am finding your posts very educational, I don't know how many liners you folks have but me I have four in .25 and couple also in .22.
I shoot probably about 3-4K slugs in .25 and find out that no one original - out of box size - accuracy was close enough to what I had resized to a specific liner. Each twist rate different OD and different RPM speed. It was a long and pricey learning curve but I think I have learned things.
Me personally I cannot accept results shooting 50 meters with slugs not even for fun of it, but at least 100M.
Also, I started resizing pellets first and I did several batches with slugs... from my own experience for my own purchased Brand slugs or pellets - the custom re-resized OD's worked the best scores.
And finally I still got back to MK2's and MK1's. Same re-sized for friction consistency.

 

[qball]

The .25 queen slugs shoot amazing out of my dynamic with 1:16 twist, with calmer wind I can hit soda cans at 330 yards and misses are mere inches vs over a foot at times with NSA at less than half the BC. Certain takes some tuning and not cheap but they are worth every penny if you are into long range. In fact it easily out perform .22 LR at 200 yards and beyond.

They are so good I’m looking at a coldshot base so I can take it out to 1000 yard range.

 

[Healthservices]

The .25 queen slugs shoot amazing out of my dynamic with 1:16 twist, with calmer wind I can hit soda cans at 330 yards and misses are mere inches vs over a foot at times with NSA at less than half the BC. Certain takes some tuning and not cheap but they are worth every penny if you are into long range. In fact it easily out perform .22 LR at 200 yards and beyond.

They are so good I’m looking at a coldshot base so I can take it out to 1000 yard range.

Same here, debating between the coldshot and the less expensive Raven jack at almost half the price. I may just pull the trigger on the Ravin Jack as it is available thru Amazon and if I don't like it...


Allen

​

 

[Gambler]

I Just bought a .25 Superior heavy from huma, fun to see if I get a 1:18 or 1:16

 

[darknes]

I am finding your posts very educational, I don't know how many liners you folks have but me I have four in .25 and couple also in .22.
I shoot probably about 3-4K slugs in .25 and find out that no one original - out of box size - accuracy was close enough to what I had resized to a specific liner. Each twist rate different OD and different RPM speed. It was a long and pricey learning curve but I think I have learned things.
Me personally I cannot accept results shooting 50 meters with slugs not even for fun of it, but at least 100M.
Also, I started resizing pellets first and I did several batches with slugs... from my own experience for my own purchased Brand slugs or pellets - the custom re-resized OD's worked the best scores.
And finally I still got back to MK2's and MK1's. Same re-sized for friction consistency.

To be honest, when I see videos on YouTube showing accuracy at 35 and 50 yards, I have to laugh yes, I take it for air rifles up to 30 joules, but for more powerful ones, I take the minimum distance of 100 meters, because there you can already tell the accuracy of the air rifle even if it is not the best shooter. I personally test air rifles from 50 Joule at 125 meters or more powerful ones at 150 meters in different weather, wind, etc. I do the same when testing slugs. as for the rise of the barrel bore, there is a different rise for each weight, length and bullet caliber. as an example, a .25 weight slug of 45-65 grain needs a pitch of 1:16 to spin properly, but this is all in the external ballistics

 

[darknes]

I Just bought a .25 Superior heavy from huma, fun to see if I get a 1:18 or 1:16

I ordered a .25 liner 800mm 1:16 heavy and I will shorten it to cancel the chock to 700mm, but first I will test the full length 800mm in my dynamics, what it can do

 

[Healthservices]

I ordered a .25 liner 800mm 1:16 heavy and I will shorten it to cancel the chock to 700mm, but first I will test the full length 800mm in my dynamics, what it can do

Please share your results as I hear with the fx liners, they have to have some amount of choke as the interior dimensions are not consistent enough to do without it completely?

Allen

 

[darknes]

Please share your results as I hear with the fx liners, they have to have some amount of choke as the interior dimensions are not consistent enough to do without it completely?

Allen

I will definitely try to do some photo documentation. as for the fx liner, mine has 95% consistency, but only in the range, the beginning up to 58cm, then 2 cm of initial light chock and the last 10 cm of brutal chock, when the output at the muzzle is 6.275mm, at the beginning it is 6.356

 

[bigHUN]

...the interior dimensions are not consistent enough...

Firelap some 20 shots and test it again.

 

[coffeepan]

I asked one retailer from EU about the liners by email, the answer was a bit cryptic....They stated: "Our liners have the latest twist rates as known by FX."
I feel like they don't necessarily know themselves? Although it is marked...

So I didn't buy any.

 

[darknes]

so the liner arrived. first impressions see photo new liner is 1:18 800 mm so no 1:16 therefore disappointing. the second impression regarding the carbon sheath 700, the length is not 700, but only see the photo. so I got to work and invented and measured and created see photo. a test was also done by pulling the slug through the liner, the finding is that the 800 liner has a soft chock that started 75mm from the muzzle. I measured the original liner only 693 mm instead of 700. I shortened the new liner to 720mm, made a recrown and tried to measure the speed again, see the photo, the first part in the photo is the speed with the original liner 1:16 hard chock, the last two speeds shortened 1:18 without chock. I will still make minor adjustments. and especially the accuracy test at 125m

 

[josh9465]

so the liner arrived. first impressions see photo new liner is 1:18 800 mm so no 1:16 therefore disappointing. the second impression regarding the carbon sheath 700, the length is not 700, but only see the photo. so I got to work and invented and measured and created see photo. a test was also done by pulling the slug through the liner, the finding is that the 800 liner has a soft chock that started 75mm from the muzzle. I measured the original liner only 693 mm instead of 700. I shortened the new liner to 720mm, made a recrown and tried to measure the speed again, see the photo, the first part in the photo is the speed with the original liner 1:16 hard chock, the last two speeds shortened 1:18 without chock. I will still make minor adjustments. and especially the accuracy test at 125mView attachment 409179View attachment 409181View attachment 409180View attachment 409182View attachment 409178View attachment 409185View attachment 409187View attachment 409183View attachment 409184View attachment 409186

What’s the accuracy like without the choke.

 

[darknes]

What’s the accuracy like without the choke.

if it comes out tomorrow I would do an accuracy test at 125 meters