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Thread: Ok, slugged the bore of my Single Seven

  1. #1
    Boolit Bub
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    Ok, slugged the bore of my Single Seven

    Measures .312". How big should I size the boolits? .314"?

  2. #2
    Boolit Buddy Cast_outlaw's Avatar
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    As I understand .313 or .314 are both good

  3. #3
    Boolit Master
    rintinglen's Avatar
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    .313 works great for me, I have three, all of them measure .312, as does my Sp101.
    _________________________________________________It's not that I can't spell: it is that I can't type.

  4. #4
    Boolit Master
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    You also need to slug the cylinder throats. Ideally, they will be larger than the groove diameter of the barrel. If so, size your bullets so that a sized bullet can just be pushed through the cylinder throats with thumb pressure.
    Last edited by high standard 40; 03-26-2020 at 07:53 AM. Reason: Correction of error

  5. #5
    Boolit Master

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    I no longer have a single seven, but it was set up to shoot really well. IIRC, a 0.312 groove, 0.313 or 0.314 cylinder throats and no thread choke. It shot really well, I just didn't shoot it much and traded it. Still have 1k 32 h&r brass and 1100 327 mag brass. Most is new and unfired. I guess I should think about getting a new one to utilize my brass and boolits. lol

  6. #6
    Boolit Master Wheelguns 1961's Avatar
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    I have 2 single sevens and a gp100 in 327. I also have a 32 h&r single 6. They all have .314” throats, and they all shoot .314” bullets very good with no leading.
    Due to the price of primers, warning shots will no longer be given!

  7. #7
    Boolit Master

    alamogunr's Avatar
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    The throats on my Single Seven are .315" The barrel slugs at .312" IIRC. So far have only shot jacketed. I'm hoping to PC boolits to at least .314". Too many projects right now. Probably should have never bought the Single Seven.
    John
    W.TN

  8. #8
    Boolit Master gpidaho's Avatar
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    I measure the cylinder throats with a minus pin gauge and size the bullet at that or plus half a thousandth. Hopefully the bore is smaller than this measurement or you'll need DougGuy to open the throats to prevent leading. Gp

  9. #9
    Boolit Master
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    There is a good chance .313" or .314" will work great. I use all .314" myself. One great thing about 327 federal is the guns all seem consistent, all have similar groove, throat, and twist rates.

  10. #10
    Boolit Bub
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    Measured the cylinder throats. Came in at .314"(one was .3135")

  11. #11
    Boolit Master
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    Quote Originally Posted by vincecyr View Post
    Measured the cylinder throats. Came in at .314"(one was .3135")
    Perfect. Is that with calipers, pin gauge, throat slug, or other? If a .314" bullet is a slip fit in the throat, use that size. If too tight, use .313".

  12. #12
    Boolit Bub
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    Quote Originally Posted by megasupermagnum View Post
    Perfect. Is that with calipers, pin gauge, throat slug, or other? If a .314" bullet is a slip fit in the throat, use that size. If too tight, use .313".
    Calipers

  13. #13
    Boolit Master
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    Quote Originally Posted by vincecyr View Post
    Calipers
    It is likely a .314" bullet will be ideal. Some like to be more precise than that, but I believe you will have good results without measuring down to the .0001".

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check