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Thread: 18 or 17 in a 30 br

  1. #1
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    Oct 2019
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    18 or 17 in a 30 br

    any reason to pick an 18 twist over a 17 with bib 112's ?( in a 30 br)

  2. #2
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    Feb 2003
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    Iowa
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    twist

    NOPE just make sure you stay with bullets made with inch long or .925 jackets
    Ron

  3. #3
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    We have had several 30’s around here, and also have a weekly winter BR league, the 18’s shine in the warm weather but if you shoot in winter, they usually do not work with the best bullets once you drop into the 30’s

  4. #4
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    I have one 18

    Quote Originally Posted by tim View Post
    We have had several 30’s around here, and also have a weekly winter BR league, the 18’s shine in the warm weather but if you shoot in winter, they usually do not work with the best bullets once you drop into the 30’s
    twist Krieger (cut rifled) and concur with the comment above about its performance in cold weather. A 17 twist is, IMO, the best all-around choice.

  5. #5
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    Apr 2017
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    Randy Robinett's Advice to me...

    Quote...

    "All of my 30 Cal., competition barrels, since 1997 have been 1:18". The 112s, and other bullets based upon the .925" jacket, are ideally suited to 1:19" twist ....

    The 1:17 seems to have become the default twist rate, but, it provides a HUGE [gyroscopic stability] safety net - at 3000 FPS, the .925" based bullets, Sea-level Std conditions, it produces 1.9 Sg! A 1:19" twist would produce right at Sg 1.5 - the ballisticians "ideal" Sg target.

    You will likely be quite pleased with the 18" twist."

  6. #6
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    I shoot 1:18" Kriegers with a 114 gr 7-ogive on 0.925's. Some of my best scores have been in really cold weather (we shoot 2 Winter League matches a month in Virginia). Not sure I'm buying the notion that 18 twist 30's give up anything in cold air.

    -Lee
    www.singleactions.com

  7. #7
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    And yet, while at the IBS Score Nationals at Randy Robinet’s Webster City Iowa range, it was pointed out to me that my holes weren’t round and switching from an 18 twist to 17 twist barrel would solve that problem. I won a couple barrels there and ordered 17 twists. I was and am I still shooting BIB 118 grain bullets at 2980 fps. It was Ron Berg who pointed out the shaded, out of round holes. I thank him for that.

  8. #8
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    Lee

    Quote Originally Posted by Lee Martin View Post
    I shoot 1:18" Kriegers with a 114 gr 7-ogive on 0.925's. Some of my best scores have been in really cold weather (we shoot 2 Winter League matches a month in Virginia). Not sure I'm buying the notion that 18 twist 30's give up anything in cold air.

    -Lee
    www.singleactions.com
    you guys don't get "cold" weather. Merry Christmas. Common back to the Firecracker in 2022. --Greg

  9. #9
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    Very true Greg. We don't get cold like you all have up Maine. But we do sometimes shoot Winter League in 20's and 30's.

    I'll definitely be up for the Firecracker next spring. Wayne and I were talking just the other day about booking our rooms.

    -Lee
    www.singleactions.com

  10. #10
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    Quote Originally Posted by Lee Martin View Post
    I shoot 1:18" Kriegers with a 114 gr 7-ogive on 0.925's. Some of my best scores have been in really cold weather (we shoot 2 Winter League matches a month in Virginia). Not sure I'm buying the notion that 18 twist 30's give up anything in cold air.

    -Lee
    www.singleactions.com
    Come up to NY. I’ll show you 18’s that group in the .1’s in warm weather, going through the paper sideways when it gets cold, I’m not talking Virginia” gotta wear a sweater” cold, I’m talking cold….as in 10-15 degrees.

  11. #11
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    I believe you Tim. All I can say is I've shot .30's in teen temperatures and have never seen yaw in the paper (we do occasionally get sub-20's in Northern VA). Maybe I just got lucky with my 1:18's.

    -Lee
    www.singleactions.com

  12. #12
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    Quote Originally Posted by Lee Martin View Post
    I believe you Tim. All I can say is I've shot .30's in teen temperatures and have never seen yaw in the paper (we do occasionally get sub-20's in Northern VA). Maybe I just got lucky with my 1:18's.

    -Lee
    www.singleactions.com
    I’m just funnin with you. I know it’s bullet/speed related but you must admit the 18’s are right on that hairy edge.
    Have a nice holiday season.

  13. #13
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    I've been through

    quit a few 30 barrels over the years and while one of the best barrels I ever had was an 18 in a 308 Obermeyer, I pretty much settled on 17's a long time ago. I use to shoot 110gn bullets through it sometimes and it loved them. One of the very best barrels I had, actually two of the very best barrels I have had I sold to Francis with that lovely Blue Hunter Gun. Two hummers, for sure. I don't remember the twist of them but one was a Hart and the other a PacNor.

    I bought an HBR rifle off BRC two or three years ago and it came wit a 1-18 and a 1-19.5! I didn't like the rifle so sold it to a friend who has been shooting the 1-18 and it has shot very well.

    I still prefer the 17 and can't give a good answer as to why, just old and stuck in my ways I guess.

    Pete

  14. #14
    Join Date
    Oct 2019
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    776
    thanks for the input and the whys and why not's
    a 17 it will be

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