Which is better for 44 grain JSBs? I heard the 1:40 was made specifically for 44 grain JSBs.
Anyone tested both?
Anyone tested both?
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FX What’s the difference? FX .30 cal 1:22 twist rate versus 1:37 (a.k.a. 1:40) twist rate
- Thread starter Maizen
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Far as I understand the slower twist is better for pellets. So I'd say you're right. The 40 was originally a pellet only rate. The 37 is for light weight slugs and pellets. There also exists a 1:22 for heavy slugs.
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Well I think both 1:40 and 1:37 are used synonymously…believe they are the same. I don’t think they’d make them separate. Unless the 1:40 is for 700mm and the 1:37 is for 500mm
In any case, anyone tested both the 1:22 and 1:40 side by side with 44 grain pellets?
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I have 30 cal crown with 1:22 600mm liner, shoots decent 43gn slugs @ 900fps, going to try heavier slugs later.
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Yeah see…I’m not shooting slugs. I’d 100% use the 1:22 if I was using slugs. I’m just trying to figure out which is best for 44 grain pellets.
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The pellet A stx was 40, the factory supplied superiors later were 37, superior heavy is 22. I dont think a stx slug liner ever existed
I hate to sound like a dick, but the 40 or 37 will be better. They are designed specifically for those pellets? So unless you get a bad pellet a or superior liner, then the 1:22 should not shoot better for any reason with those pellets. I have both the 40 and 37. I never tested them against eachother and only use the 37. It is plenty accurate that I have no reason to use the 40. So, it is just in my extras pile. The 37 is intended for light slugs as well where the 40 never was. It's safe to assume there is a difference in the choke as well between these two, though I have never checked.
Also, I will never use a 1:22 for slugs because my Crown is a mk1 first of all, and it only makes around 90fpe give or take. In my opinion only suitable for light weight slugs. Which again, the 1:37 is designed for. In addition to the 44gr jsbs.
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Ohhhhh…that makes more sense. So initial STXs were 1:40
Superior is 1:22?
Do I have that right?
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Well, superior is 1:37. Superior heavy is 1:22 All superiors were designed with the intent to shoot FX's own brand of sugs pretty well while also shooting factory jsb pellets well thru the same barrel. Where the heavy to my knowledge never came on any gun from the factory. But could be ordered after the fact. Though I have no clue what the pantheras and the like came with, I wouldnt be surprised if some have heavy liners for how much power they output. My experience with my .22 superior (not heavy) has been VERY good with slugs and pellets both. I have never ran slugs thru my .30 1:37 barrel as I just dont use it much. But probably will try slugs some day. Honestly it's pretty overkill for what I usually do with my airguns.
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No not at all, you’re good man. I’m just trying to get the facts settled. Yes I would expect the slower 1:37 and 1:40 to shoot pellets better given that slugs weren’t even considered back then.
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Well slugs were being considered with the 1:37. Not the 40. But the slugs being used were hollow and short, so not long or heavy ones.
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Anything under 1:30 can be considered a slug liner/barrel. Anything over is more for pellets. Diabolo ellets self-stabilize due to their shuttlecock-like shape, whereas slugs need to spin faster (like a regular bullet) IOT not tumble in flight.
I know this is old, but the thread shows some FX part numbers and twist rates. As you can see from a post by @FX-USA (who has not been online since 11/2023), he claims a twist rate slightly different from the charts on one barrel, but I'd postulate that any number within 3-5" of twist rate are about the same. Perhaps someone can reach out to the FX crew on Facebook and get an up-to-date barrel part number chart as posted in this thread:
www.airgunnation.com
I know this is old, but the thread shows some FX part numbers and twist rates. As you can see from a post by @FX-USA (who has not been online since 11/2023), he claims a twist rate slightly different from the charts on one barrel, but I'd postulate that any number within 3-5" of twist rate are about the same. Perhaps someone can reach out to the FX crew on Facebook and get an up-to-date barrel part number chart as posted in this thread:
FX STX Superior Liner Twist Rate?
Hello AirgunNation Peoples, Does anyone know the twist rate of the new .25 caliber 600mm FX STX Superior Liners?
www.airgunnation.com Upvote 0