6X45 VS 6TCU

Discussion in 'Main Message Board' started by Sniper338, Jan 11, 2018.

  1. Sniper338

    Sniper338

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    6x45 vs 6TCU?

    The TCU looks to be about the same thing but 40 degree/AI shoulder?

    Any benefit besides brass not growing and looks?
     
  2. fredo

    fredo Silver $$ Contributor

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    Figure the same performance boost a .223AI allows over its parent case. I.E., enough to be worth the effort (on a bolt action)...
     
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  3. MarkS

    MarkS Silver $$ Contributor

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    Sniper,
    Both are good rounds. The TCU's by Thompson had a very long throats, to seat heavy bullets. IF you want to shoot light bullets, check the reamer.

    Mark
     
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  4. centershot

    centershot Silver $$ Contributor

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    I love my 6mm TCU rifle. I built it on a Savage Action. It will shoot 75 grain V-max at 3000 fps and 80 Noslers at 2900 fps. This is with TAC Powder.
     
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  5. bsekf

    bsekf

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    I did this search about a year ago and decided there was not enough difference between them to care in a bolt gun. I went with the 6x45 with a 1 in 10 to save $60 for reamer rental. Couldn't be happier.

    Now if I was using a Contender I would want the TCU to get the straighter case.

    Bill
     
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  6. JSH

    JSH

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    Have had both myself. Not enough to really argue about. I have read and seen some bolt repeaters that had feeding issues with the 6TCU, all were either fixed or fixable.
    6-223/6x45 load and shoot no issues.
    Jeff
     
  7. Sniper338

    Sniper338

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    single shot borden... feeding aint a issue. Just didnt know if its worth the extra work.
     
  8. bsekf

    bsekf

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    Not familiar with the Borden, but in a break open gun I would go for the AI type case of the TCU to reduce "pushback". No extra work with the TCU, except finding a barrel guy with the TCU reamer. Both have to or should be fireformed. I think the TCU dies are getting pricey too.

    Bill
     
  9. fredo

    fredo Silver $$ Contributor

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    Having had my 6x45AI bolt gun for a few years now, can say that the "improvement" over standard is definitely worth the price of admission (for me)...
     
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  10. 'Freak

    'Freak

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    How ‘bout a 6mm from 204 Ruger brass …?
     
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  11. centershot

    centershot Silver $$ Contributor

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    That would be a 6x47 Remington. Originally made with .222 Mag brass
     
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  12. swd

    swd Yep that's me Gold $$ Contributor

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    Close but not quite. The 204 case has a bit different shoulder and slightly more capacity.
     
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  13. 'Freak

    'Freak

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    The 204’s slightly less tapered case body is also .075” longer from case head to the beginnings of its 30° shoulder.
     
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  14. Jaybo

    Jaybo Silver $$ Contributor

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    I'm fixing to build a 6 mm TCU plan on shooting in the range of 70 to 95 grains bullets what would be the best Barrel twist for this
     
  15. swd

    swd Yep that's me Gold $$ Contributor

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    A few of the longer 95's need at least a 9". I had an 8" that did fine even with 70gr Ballistic Tips and shot the 95SMK's really well for playing around at LR.
     
    Last edited: Aug 21, 2018
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  16. JSH

    JSH

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  17. fredo

    fredo Silver $$ Contributor

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    My 6x45AI has a 1:8 Krieger. It shot 70s ok while fireforming, but I was shooting some old 6x45 ammo from another rifle.
    The 1:8 really hums with loads tailored to 80, 87 & 95grainers. Super little round, you're gonna LOVE it!

    Have fun
     
  18. muleystalker

    muleystalker Gold $$ Contributor

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    Thats what I did, using a Redding 204 busing die with a 6mm expander and bushing and a 204 Forster Mic seating die with a 6mm stem. Expand to 6mm, load and shoot.
     
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  19. Boyd L.

    Boyd L. Gold $$ Contributor

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    Hmmm...
    I like it.
     
  20. GrocMax

    GrocMax

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    I like the 8 twist for everything my TCU varminter does.
     

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