9 twist 20cal. what chamber? what bullet?

[Hammerdown22]

20BR
1-9

would there be any issues with an 8 twist?
I see a lot of people running the 1-9. but the berger twist calculator shows it as barely stable. but the 8 is perfect with br velocity and my altitude.

 

[Gabe22BR]

20BR= 1-9

.375 case head-1-8

 

[Dean Slater]

I think I have talked myself out of the really overbore 20s
barrel life.
I'm leaning towards 20 dasher or 20br

20 Dasher and 20 BR are great choices but aren't going to easy on barrels either. Berger told me to use a 7 twist with a 20 Dasher and their 55gr. Bergers and that was a very expensive mistake for me. At 20 Dasher velocities they never made it to the target. They came apart. I would listen to the guys that are shooting whatever case you choose with success not Berger.

 

[c2a4r3l]

20BR 1-9 twist and 40gr bergers. Let me tell you it’s a blast in a fresh cut alfalfa field shooting ground hogs.

 

[Gabe22BR]

Competition proof- competitor # 207

https://internationalbenchrest.com/app/ibs/files-module/local/documents/MSSA%20IBS%20Match%20-1%20-3-19-2022-.pdf

 

[L.Sherm]

Numbers are just that, numbers!

 

[Gabe22BR]

Numbers are just that, numbers!

Ya like to see that fake wood don’t ya ..lol
Them is the only 600yd matches I’ve carried the 20BRAI too…

 

[L.Sherm]

Ya like to see that fake wood don’t ya ..lol
Them is the only 600yd matches I’ve carried the 20BRAI too…

No in referencing bergers twist calculator.
You, I and others know 9 twist with the 55's is were its at no matter what twist calculators say.

 

[Gabe22BR]

Only time I had guys to whoop out the 20 cal in competition…
I started NBRSA last yr… I could see it doing good there too !!
Just gotta be brave & use it



Wish I could find a couple 20cal barrels..

 

[Hntnhrd]

Only time I had guys to whoop out the 20 cal in competition…
I started NBRSA last yr… I could see it doing good there too !!
Just gotta be brave & use it



Wish I could find a couple 20cal barrels..

There is one in the classifieds right now!

 

[Hntnhrd]

20 br!! Mine is a 1/10 and I have 39 grain Sierra Blitzkings printing cloverleafs at 4200 fps. Since you have two barrels chamber them both the same and when one is done screw on the second! That’s why they make barrels with threads!

 

[1raggedhole]

I have 2, bartlein 9 twist 20 cal barrels. trying to decide what to chamber them in.

the info

the barrels are 9 twist, 27in.

my location and altitude is il and 600ft

(thought that might play a role in bullet selection)

trying to decide on chamber and bullet.

what's your favorite and experience with such?

20-250?

20xc?

20br ,bra?

heck why not 20-220 swift ,haha.

40 grainers?

55? will 9 twist stabilize?

I had a 10t in a 204Ruger and often had bullets coming apart with 32 gr at 4125 fps. So, I’d watch your speed/rpm