So what s the word on 50-55 gr 20 cal bullets

Discussion in 'Small Stuff--22s, 20s, and 17s' started by Doug30racer, Jun 13, 2019.

  1. steve123

    steve123

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    You probably read one of my posts on this subject.

    20x47L was a fail with a 9 twist krieger, yes by a little less than 300 rounds the 55's were smoking, giving comet trails on paper, and a generous portion not making it to the target.

    I complained to Krieger and they wouldn't replace the barrel.

    Fortunately 40 vmax work at 4100 fps??? but I haven't used that barrel in a few years.

    Included in my goal for 20x47L was using it with 10 round AI mags, that part worked.

    I still have all the reloading stuff so if I do one again I'll try a 10 twist as well.
     
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  2. 7315br

    7315br Silver $$ Contributor

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    steve123, I do recall your comments, and others also. Some folks were having 20 cal Berger 55 gr bullet failures right from the get-go. I wonder if the cut-rifled barrels could be contributing to the problem? Just don't know. Probably more of the luck of the draw than anything...LOL! 7315br
     
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  3. Stan Taylor

    Stan Taylor Gold $$ Contributor

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    From a pretty reliable source Berger 55 grain 20 calibers will be available in a couple weeks at a Graf & Sons
     
  4. TroyG

    TroyG

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    Has anyone tried progressive twists like Bartlein gain twist in the big 20s. I drank the Berger 55gr 204 bullet and committed to several thousand bullets. Trying to decide on twist. I only plan to shoot the 55gr bullets in colder Saskatchewan winter temperatures. I am mostly between 2200-2500 ft above sea level and like to be out calling and hunting coyotes when it gets down to -25F or lower. I am thinking a gain twist of 1/9 or 1/9.5-1/8 to try. Anyone go down this road. I
     
  5. 7315br

    7315br Silver $$ Contributor

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    TroyG, I don't see a problem with a 9-twist at the altitudes you are talking about. I shot the 9-twist Bartlein in the 20 BR quite a bit out to 500 yds (with a few groups at 2" or less) at elevations below 1,000' with no issues b4 I moved back out west. I did not shoot it in temperatures that cold though. I wasn't aware that Bartlein had a gain twist available in a 20 cal 1:9 twist. That would be a interesting concept! 7315br
     
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  6. Stan Taylor

    Stan Taylor Gold $$ Contributor

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    If I was committed to a 20 br I probably would do a straight 8 1/2 twist no gain twist.
     
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  7. TroyG

    TroyG

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    Case is likely going to be a 20BR or 20BRA.
     
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  8. TAJ45

    TAJ45 Gold $$ Contributor

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    Reading through this for 2nd time, I was ruminating abt an 8.5tw also.
    I wonder what are the diffs of the bearing surface of B.Bob's and the 55 Bergers is. Maybe explain some of the kablooies?
     

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