Tikka barrel twist stamped incorrectly.

langfordbc

langfordbc

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On the high line, BC
Bought a Tikka compact 243 a couple years ago that I just started to build a load for. Picked 95gn Barnes LRX as the bullet, but in the first few rounds they were clearly tumbling. That bullet should be fine in an 8" twist, which it is stamped as. Checked it a few times with an oiled jag and marked rod, and it is actually a 10" twist.

It looks like this has happened to others out there. Anybody here encounter ever this themselves? I've emailed the retailer and asked about a contact with Beretta Canada.

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You are certain that jag followed the rifling perfectly?

If lots of people are reporting the problem I’m sure you are correct but if it were me I might borrow a bore scope or something before shipping it off to beretta. Then again I’m no gunsmith. Good luck.
 
redneck09 said:
You are certain that jag followed the rifling perfectly?

If lots of people are reporting the problem I’m sure you are correct but if it were me I might borrow a bore scope or something before shipping it off to beretta. Then again I’m no gunsmith. Good luck.
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No, not 100%. But I did it several times and all were at 10” or close to it, and nowhere near 8”. Inability to stabilize a 95 grain bullet was the initial red flag.

I’m not sure lots of people are reporting the problem but it does come up when you search, and the rifle comes from 2023 when Tikka switched from 10” to 8”.
 
langfordbc said:
No, not 100%. But I did it several times and all were at 10” or close to it, and nowhere near 8”. Inability to stabilize a 95 grain bullet was the initial red flag.

I’m not sure lots of people are reporting the problem but it does come up when you search, and the rifle comes from 2023 when Tikka switched from 10” to 8”.
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Yea I am sure you are correct. I have a 8” 243 and it stabilizes 112 grain match burners but just barely at sea level. The altitude that I do my shooting at helps a lot. Mono metal bullets such as the LRX tend to be a good bit longer than lead bullets of the same weight. They require more twist.

I know that Barnes lists a 8” for the 95grain lrx. But they also say that their bullets expand below 2000fps and a quick YouTube search will disprove that. I would check that stabilization at your altitude and speeds.

If I were to get another fast twist 243 I would get a 7.5”. I think that there is a reason the 6 creed uses a 7.5”.
 
Redneck09 :
Yea I am sure you are correct. I have a 8” 243 and it stabilizes 112 grain match burners but just barely at sea level. The altitude that I do my shooting at helps a lot. Mono metal bullets such as the LRX tend to be a good bit longer than lead bullets of the same weight. They require more twist.

How do you know ? it JUST BARELY STABILIZES THE 112 s -with a 1-8. . Pls explain that to me 🤷‍♂️ And what speed are you sending them at ? Thxs 😊
 
remington jim said:
Redneck09 :
Yea I am sure you are correct. I have a 8” 243 and it stabilizes 112 grain match burners but just barely at sea level. The altitude that I do my shooting at helps a lot. Mono metal bullets such as the LRX tend to be a good bit longer than lead bullets of the same weight. They require more twist.

How do you know ? it JUST BARELY STABILIZES THE 112 s -with a 1-8. . Pls explain that to me 🤷‍♂️ And what speed are you sending them at ? Thxs 😊
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Twist rate is relatable to bullet length, not bullet weight.

Read about the Greenhill formula.
 
remington jim said:
Redneck09 :
Yea I am sure you are correct. I have a 8” 243 and it stabilizes 112 grain match burners but just barely at sea level. The altitude that I do my shooting at helps a lot. Mono metal bullets such as the LRX tend to be a good bit longer than lead bullets of the same weight. They require more twist.

How do you know ? it JUST BARELY STABILIZES THE 112 s -with a 1-8. . Pls explain that to me 🤷‍♂️ And what speed are you sending them at ? Thxs 😊
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I guess I don’t know for sure. I use the Berger calculator for twist rate and stability and it said the bullet (112 grain Barnes match burners) was marginally stable out of my barrel at sea level. It even told me that there was a small drop in my BC due to the lack of stability (I forget the percent) 112s are moving around 3k out of my 26” barrel. I have never shot them through a chronograph so that is just an estimate.

Berger stability calculator takes bullet length into the equation. They say that is the big factor but I don’t know a lot about that. Just used that calculator when I selected my loads.

I did just check and that lrx is shorter than the match burners that I use and should stabilize even better so forget about it I guess. Don’t want to hijack the thread.

Hope the OP has a good experience with customer service.
 
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