8.5 Twist for .284 Win in F-Class?

Discussion in 'Big Stuff--7mm, 30 Cal, .338+' started by Killick, Feb 10, 2020.

  1. Killick

    Killick Silver $$ Contributor

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    Is there any advantage to an 8.5 twist as opposed to a 9 twist for the 190 gr Berger Hyb's in a 32" bbl? And is there any disadvantage with an 8.5 twist for the 180's? Also, this is for a Brux bbl I won at SWN and I was wondering what lands and grooves they offer for an F-Class bbl?
    Too early?...probably...
     
  2. Killick

    Killick Silver $$ Contributor

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    My gut tells me to go with the 184's instead of the 190's. With that being said, does the 184 require more than the standard .220 FB?
     
  3. Terry

    Terry Gold $$ Contributor

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    I have been buying 9 twist 4 grove barrels from them.
    They are 20 minutes from home.
    Great guys!

    Shooting 184's.
     
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  4. Killick

    Killick Silver $$ Contributor

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    Thanks, Terry. What is your FB?
     
  5. Terry

    Terry Gold $$ Contributor

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    .225
     
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  6. Killick

    Killick Silver $$ Contributor

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    Outstanding!
     
  7. Willow

    Willow

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    I like 8.5 twist barrels for the 184s. Now I've got a 284 Shehane reamer with a .188 freebore and one of my mates just did some initial foreforming tonight - he was able to jump the 184s 15thou off that freebore - chambering was extremely smooth with a brand new Barnard action with no hint of resistance and likewise extraction was just as easy, so only early days but it looks like it will be a shooter. Barrel is a 32 Bartein, 8.5 twist, 4 groove.

    I run a 32 Brux, 8.5 twist 4 groove and it's a cracker of a barrel. I'd suggest the 8.5 twist for the 184s and the 190s, even if you only try a box of the 190s to see if they show promise.
     
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  8. Rope2horns

    Rope2horns Norm Harrold Silver $$ Contributor

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    I've done ok with a 9twist and 184's....a 8.5twist will work great with both the 184's and 180's.....Haven't tried the 190's yet so I can only assume (you know what that will get ya) that a 8.5 twist will be fine as well.
     
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  9. F Class John

    F Class John NRA Life Member Gold $$ Contributor

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    I'm a big fan of 8.5 barrels. Shot my 180s, 184s and now my 190s in them with zero issues. That being said I've never chambered up a 9 twist so I can't personally compare.
     
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  10. 1shot

    1shot

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    I'm shooting a 8.25 twist in a Shehane with both 183 SMK's and 184 Bergers with -0- issues. I was previously shooting a 9 twist and it shot ok but never great at my home range a 1,000 ASL elevation. Took it to Byers Colorado that sits at 5,500 ASL and it shot lights out! With that said, I'm sure an 8.5 twist will work just fine for you.
    I hope this helps,

    Lloyd
     
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  11. Willow

    Willow

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    Zero issue with an 8.5 twist at sea level if that's a concern.
     
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  12. Hermantk

    Hermantk Silver $$ Contributor

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    It may be just coincidence but I have 4 barrels (31") for my F-open .284 Win, running 184s. One is an 8 twist and the other 3 are 8.5. The 8 twist is my serious competition barrel because it consistently shoots groups at 300M that are roughly 1/2 the size that i get from the 8.5s.
     
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  13. Ackley Kid

    Ackley Kid

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    8.5 will serve you well . As Lloyd has stated your elevation will play a role in weather it is required over a 9 . I shoot 8.5 vs the 9 twist as my home range is 700ft above sea level. All the ranges west of me are all uphill ....
     
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  14. David Christian

    David Christian Gold $$ Contributor

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    Brux, 8.5 twist over 7 different barrels shooting 184’s and 180’s. .220 FB. All good!
     
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