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  #1  
Old 10-11-2017, 05:57 PM
sgtg sgtg is offline
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Default 55 berger twist

I know this has probably been asked before, but has anyone shot 20 cal.55 Bergers in a 1/10 twist with any luck ? Thanks sgtg
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Old 10-11-2017, 08:52 PM
Hotshot Hotshot is offline
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I couldn't make them work in my 20BR. Holes are nice and round but the groups 1 1/2 to 2 inch
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Old 10-11-2017, 09:09 PM
B23 B23 is offline
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I have a 20-250 build going together right now to pretty much exclusively shoot the Berger 55's. We spent a great deal of time talking about what twist rate to go with, 1-9 or 1-8, ended up going 1-8tw Krieger to be on the safe side though I've heard some shoot them fine out of a 1-9tw.

Ken Weaver has built quite a few 20-250's as well as other hot rod 20's and he was one of the people I talked to before ordering a barrel, he suggested the 1-8tw, especially if you plan on mostly shooting the Berger 55's.

I don't believe a 1-10tw would be nearly fast enough to stabilize those 55's.
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  #4  
Old 10-12-2017, 04:33 AM
Jordan Jordan is offline
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Did not know you could order an 8 twist .20 cal from Krieger. Is that a special order item?
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  #5  
Old 10-12-2017, 06:57 AM
PGW Steve PGW Steve is offline
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When in doubt, over spin it. About 20 years ago, I had a 6-284. It was set up to shoot the 107 Sierras at a good clip, I'd have to consult my old log but 3400 sounds close. I had an 8 or 8.5 twist on the rifle, and it was a solid .5moa gun at 300 yards.....was great in the wind at 1000.

I ended up going on the PS magazine 'Prairie Dog Conference' and one of Chuck's rules was no bullets over 100gr. I loaded up some 70gr Nosler BT and again, I'd have to check my logs but I think I hit 4100ish. Got the same .5moa groups at 300.

I think those 70gr would have been quite happy out of a 14 twist, but performed excellent in a twist almost twice as fast. That rifle demonstrated to me that you can't over stabilize a bullet.....unless it's a thin jacket and blue streaks.
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  #6  
Old 10-12-2017, 01:18 PM
sgtg sgtg is offline
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Default Thanks

Thanks guys for all the replies, I thought that would be the case.

I got an AR 15 barrel with 1/10- 20 inch for my new coyote gun and will shoot 35 Bergers just thought about playing with some 55's, but after I posted the question it occurred to me they could not be shot at mag length anyway.
So Thanks again, always fun to kick stuff around with you guys. sgtg
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  #7  
Old 10-12-2017, 02:14 PM
B23 B23 is offline
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Quote:
Originally Posted by Jordan View Post
Did not know you could order an 8 twist .20 cal from Krieger. Is that a special order item?
I think with cut rifled barrels they can do about any twist you want so I'm not sure it was a special order per say but definitely not something they keep in stock though. The one thing Krieger won't do is make a 20 cal barrel longer than a finish length of 26 inches.
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Old 10-12-2017, 03:42 PM
Jordan Jordan is offline
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Thanks B23! Good to know that.
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  #9  
Old 10-12-2017, 03:52 PM
Ratbuster Ratbuster is offline
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I could be wrong but I think Berger recommends 7 twist for that bullet
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  #10  
Old 10-12-2017, 04:24 PM
B23 B23 is offline
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Quote:
Originally Posted by Ratbuster View Post
I could be wrong but I think Berger recommends 7 twist for that bullet
This is true but I believe they recommend a 7tw for their .20cal 55's so the smaller case capacity .20's can get optimal stability factor for maximum BC when shot aroung 3200 fps.

The larger case capacity wildcats that can shoot this bullet 3700 fps or faster, per Berger, will be at or above the stability factor using a 1-8tw barrel.
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