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  #1  
Old 05-19-2022, 02:09 PM
shaun1826 shaun1826 is offline
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Default 20 VT twist rate

I’ve read a bunch of threads on this. I plan to use a barrel in the 18”-20” range.

Is there any downside/accuracy loss going with a 11 twist instead of 12 twist for the 32 vmax to 40 vmax bullets?

Is there any downside/accuracy loss going with a 10 twist instead of 11 twist for the 32 vmax to 40 vmax bullets?

Edited to add:
What about an 9 or 8 twist if I want to play with 55 bergers in addition to the 32-40’s?

Best,
Shaun

Last edited by shaun1826; 05-19-2022 at 03:19 PM. Reason: Adding info
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  #2  
Old 05-19-2022, 02:44 PM
B23 B23 is offline
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Quote:
Originally Posted by shaun1826 View Post
I’ve read a bunch of threads on this. I plan to use a barrel in the 18”-20” range.

Is there any downside/accuracy loss going with a 11 twist instead of 12 twist for the 32 vmax to 40 vmax bullets?

Is there any downside/accuracy loss going with a 10 twist instead of 11 twist for the 32 vmax to 40 vmax bullets?

Best,
Shaun
I'd use at least an 11tw and with regard to a 10 vs 11 I don't believe you could go wrong with either. I used a Hart 11tw on my 20-222 build but I'd have no concern using a 10tw either.

If you can get one or the other in the contour and manufacture you like that would be the one I bought first.
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  #3  
Old 05-19-2022, 02:51 PM
Bill K Bill K is offline
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This has been hashed and rehashed numerous times over the past few years.
Generally the 1/12 twist will not stablize and 20 cal bullet over 39 grains.

The majority of 20 cal users go with the 1/11 twist, however if you want a 1/10 it would serve you well also.
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Old 05-19-2022, 06:45 PM
jimreed1948 jimreed1948 is offline
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Quote:
Originally Posted by Bill K View Post
This has been hashed and rehashed numerous times over the past few years.
Generally the 1/12 twist will not stablize and 20 cal bullet over 39 grains.

The majority of 20 cal users go with the 1/11 twist, however if you want a 1/10 it would serve you well also.
I agree with Bill K. Both of mine are 10 twist and handle 40 grainers without issue.
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  #5  
Old 05-19-2022, 07:08 PM
shaun1826 shaun1826 is offline
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I contacted Hornady and they said between 10 and 14 twist is good for the 32 and 40 vmax. I wonder if there is a bit of margin of safety built in on the fast end spec and if 9 twist would work on the 32? That would open up the possibility of playing with the Berger 55.
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  #6  
Old 05-19-2022, 07:27 PM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by shaun1826 View Post
I contacted Hornady and they said between 10 and 14 twist is good for the 32 and 40 vmax. I wonder if there is a bit of margin of safety built in on the fast end spec and if 9 twist would work on the 32? That would open up the possibility of playing with the Berger 55.
The Amax bullets are longer than most other bullets weighing the same so I truly doubt that the 40 grain bullets would stabilize in a 12" or especially in a slower 14" twist barrel. Also, Rpm's on the 32 grain bullets might be a concern with some 32 grain bullets coming apart in flight on the 9" twist barrel. I can't recall anyone having issues, but maybe, and it's something to at least think about....

A 9" twist barrel should allow for the use of the 55 grain bullets.

-BCB
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Old 05-19-2022, 09:48 PM
L.Sherm L.Sherm is offline
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Quote:
Originally Posted by shaun1826 View Post
I contacted Hornady and they said between 10 and 14 twist is good for the 32 and 40 vmax. I wonder if there is a bit of margin of safety built in on the fast end spec and if 9 twist would work on the 32? That would open up the possibility of playing with the Berger 55.
I dont even know anybody who makes a 14tw 20 cal barrel, I sure wouldn't want one.
I doudt it would even stabilize a 32 grain 20 cal bullet
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Old 05-19-2022, 09:55 PM
Bill K Bill K is offline
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Shaun: The 20 Vt is one fine cartridge and with a 1/11 or even a 1/10 will work wonders with the 32-40 grain bullets, into the 400yrd range.
Now, really, if you want to start shooting heavier one's up in the 50 grain or more class, then move up to a different cartridge.
Something like the 204 R or maybe a 20 PPC.
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  #9  
Old 05-19-2022, 10:07 PM
Bayou City Boy Bayou City Boy is offline
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Quote:
Originally Posted by Bill K View Post
Shaun: The 20 Vt is one fine cartridge and with a 1/11 or even a 1/10 will work wonders with the 32-40 grain bullets, into the 400yrd range.
Now, really, if you want to start shooting heavier one's up in the 50 grain or more class, then move up to a different cartridge.
Something like the 204 R or maybe a 20 PPC.
"Good post, Bill", BCB says while looking over his shoulder for incoming flack.....

The only 20 caliber I've considered them in is my 20-250, and that's with an 11" twist barrel. I actually bought a small stash of the Hornady heavy for caliber bullets when they had them available. I doubt that the barrel will outlive them. The 50 works ok to iffy for it, and it's much easier for me to just use a 22-250 with 50-52 grain .224" bullets. So far the only thing that has impressed me about the 20-250 is how quickly it eats barrels. Yikes......!!

I played with swaging a shorter heavy 20 caliber bullet but I never got into it very hard. It messed big time with my 38 grain hp bullet die settings so I gave it up.

-BCB
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Last edited by Bayou City Boy; 05-19-2022 at 11:13 PM.
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  #10  
Old 05-19-2022, 11:11 PM
Bill K Bill K is offline
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I thought about a 20-250, but then again, I thought no, it is somewhat overbore and would eat the throat out too fast.
I stick with the 20 VT, 20-223ai and just have fun.
If I do move into the 250 case, I will stick to my old tried and true 22-250, which has served me for many a year.
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