Overspin

Farleg said:
Gday MG
Welcome from down under

Looking forward to your journey

Overspin I doubt will be a issue , I’ve got to nearly 500k rpm & no issues
Slippage on the few tests I done on that & no issues

Muddy be a good thread to start on rpm heat terminal etc but my only advice is go get a few more bottles of wine 😜
Cheers
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Cheers Cobba!
kneedeep said:
@Sprint1006 shoots a 338/175hh in his 8.6 3 twist with extremely good terminal performance. I can’t wait to see more results from this combo. Maybe he can elaborate on accuracy as well. He likely has on the past, I just don’t recall for sure.

Good luck and welcome to the forum
Kneedeep
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Thank you!
Muddyboots said:
IMO if you stay with 1 twist of the recommendation for the bullet, you will be fine.
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Indeed!
kneedeep said:
@MisterGoose

Here is an old thread discussing twist and velocity

Twist and velocity.

I saw an @ButterBean post elsewhere, and thought this could be a better place for discussion. Thoughts on how much velocity is lost with increased twist, or the article. https://bulletin.accurateshooter.com/2015/02/does-barrel-twist-rate-affect-muzzle-velocity-litz-test/
hammerbullets.com
Click to expand...

Very Interesting!


The Caliber is 25 SST by the way. Should have mentioned that! 😅🤣coming out of a 26" CF IBI barrel


MG
 
kneedeep said:
It’s been a year or so ago but Bryan Litz posted a slow motion bullet exiting a barrel. It was a copper mono in a 1 twist.


Kneedeep
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On Facebook, he has it posted on Nov 2, 2022. Looks like a company "B" bullet with a sharpie line drawn down the side to show rotation in slow-mo.
 
kneedeep said:
@Sprint1006 shoots a 338/175hh in his 8.6 3 twist with extremely good terminal performance. I can’t wait to see more results from this combo. Maybe he can elaborate on accuracy as well. He likely has on the past, I just don’t recall for sure.

Good luck and welcome to the forum
Kneedeep
Click to expand...
My accuracy with that particular combo was just over an inch at 100 yards. I am not the best shooter but I do think I have found a better combo for accuracy. Still working on it hope to report back in the next couple weeks and I’m about a month out from taking this combo on a cow elk hunt. Hope to get a 150-200 yard shot on a cow to see results of a little further away. I will report back once I shoot one no matter the distance.
 
Sprint1006 said:
My accuracy with that particular combo was just over an inch at 100 yards. I am not the best shooter but I do think I have found a better combo for accuracy. Still working on it hope to report back in the next couple weeks and I’m about a month out from taking this combo on a cow elk hunt. Hope to get a 150-200 yard shot on a cow to see results of a little further away. I will report back once I shoot one no matter the distance.
Click to expand...
Gday sprint
Hope all goes to plan ( pics please ) also watching with interest

Curious What’s the other combo ?

Cheers
 
I could see overspinning causing higher pressures, separating jackets etc. A cnc bullet might not see the same effect. I don't know...perspectives change
I just feel all this fast twist stuff is going to have a downside once a bit of sensability comes over these longreachers.
 
Farleg said:
Gday
Oh no The Sherman clan has arrived 🤣🤣
Cheers
Click to expand...
OK Farleg...calm down...working up my newest Sherman. Report to follow soon. Stay tuned😀
It's gonna be another speedster. Hoping for 3700-3800 with the 125HHT. Like my 6.5 Max on steroids. 7.5 twist, 30" barrel.

To @Comerade , so far, we haven't found an upper limit on rpms with the Hammers. Stability factors of 6+ achieved so far, no ill effect noted.
(Edit: one glitch? Found by Butterbean with his .22 wildcat?)
 
Actually, some of this has been exaggerated?
Ours are normal whitetail for the southeastern US. An average buck is ~140lbs. Same as Texas and the Pacific blacktails?
We rarely get a 200 pounder+ like the midwest or far north, or huge western muleys?
As far as the rifle....just another toy....but a quick one😁!!!
 
gltaylor said:
OK Farleg...calm down...working up my newest Sherman. Report to follow soon. Stay tuned😀
It's gonna be another speedster. Hoping for 3700-3800 with the 125HHT. Like my 6.5 Max on steroids. 7.5 twist, 30" barrel.

To @Comerade , so far, we haven't found an upper limit on rpms with the Hammers. Stability factors of 6+ achieved so far, no ill effect noted.
(Edit: one glitch? Found by Butterbean with his .22 wildcat?)
Click to expand...
The stability factor with my 8.6 blackout is over 30, like 580,000rpms. The 175 grain hammer hunter performed flawlessly on a moose and hope to test again on an elk in the next couple of weeks.
 
My understanding is the 1:3 is for bullet weights below certain weights and 1:4 for heavier. Don't recall the "line" though.

Do you know the velocity he was getting?
 
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