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Thread: what is the bore size of the 416's

  1. #1
    Boolit Master Oklahoma Rebel's Avatar
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    what is the bore size of the 416's

    I am mainly asking about the ruger but also the rem mag and rigby, are they all the same? I looked in accurate but none of the 40-41 labeled molds actually said designed for the 416 so and so.
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  2. #2
    Boolit Grand Master


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    The nominal bore diameter of US .416 barrels is .408, groove is +.008
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    Boolit Master Oklahoma Rebel's Avatar
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    alright, thanks a lot, I was just curious, they almost never are what they say they are,lol
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    Boolit Grand Master fredj338's Avatar
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    Quote Originally Posted by swheeler View Post
    The nominal bore diameter of US .416 barrels is .408, groove is +.008
    Well maybe.
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  5. #5
    Boolit Grand Master
    9.3X62AL's Avatar
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    Diameters can be "poetic", for certain. I buy the firearm FIRST, then do "Tale of the Tape" on critical dimensions, then buy die set and mould(s).
    I don't paint bullets. I like Black Rifle Coffee. Sacred cows are always fair game. California is to the United States what Syria is to Russia and North Korea is to China/South Korea/Japan--a Hermit Kingdom detached from the real world and led by delusional maniacs, an economic and social basket case sustained by "foreign" aid so as to not lose military bases.

  6. #6
    Boolit Master Oklahoma Rebel's Avatar
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    I know about slugging and chamber casting, is that what you mean "tale of the tape".........measure?
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  7. #7
    Boolit Grand Master


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    So you are confirming what I said? .416 GROOVE DIAMETER-.408 BORE DIAMETER. .408+.008=.416
    Last edited by swheeler; 09-18-2017 at 06:23 PM. Reason: change + to =
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  8. #8
    Boolit Grand Master


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    Quote Originally Posted by Oklahoma Rebel View Post
    I am mainly asking about the ruger but also the rem mag and rigby, are they all the same? I looked in accurate but none of the 40-41 labeled molds actually said designed for the 416 so and so.
    Travis, I think where the confusion is coming from is the use of BORE to actually mean GROOVE diameter. Bore diameter is the measurement of the hole at the tops of the lands, groove diameter is to the bottom of the grooves, Fred is making the same mistake. Since we as reloaders of cast need the info of both diameters, especially if ordering a bore rider mold, it is best to use the correct terms. If you are using newly manufactured barrels from a reputable manufacturer the groove will be within a couple ten thousands of an inch of stated bore and groove diameters( Remington hammered barrels being the exception I've found twice).
    Last edited by swheeler; 09-18-2017 at 06:49 PM.
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  9. #9
    Boolit Grand Master


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    416Rigby1.26026.186.408.41616.5


    .416Rem.Mag./Weath.Mag.1.2626.186.408.41614.0

    This is from Lothar Walther site, Blank diameter 1.26",length 26.186", bore diameter .408", groove diameter .416", and as you can see they recommend 1:16.5" twist for Rigby and 1:14 for Rem and Weatherby mags.
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  10. #10
    Boolit Grand Master


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    http://www.accuratemolds.com/bullet_...=42-400R-D.png Look here he has several of them that will work for the .416's, be it Rigby, Remington, Weatherby, Ruger or Taylor. Since you don't own the rifle you can look at his 42 caliber molds at his site.
    Last edited by swheeler; 09-18-2017 at 08:01 PM.
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  11. #11
    Boolit Grand Master


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    Travis this is a new take off cz 550 416 Rigby, you can have it for 150.00 plus shippingClick image for larger version. 

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  12. #12
    Boolit Grand Master
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    Quote Originally Posted by Oklahoma Rebel View Post
    I know about slugging and chamber casting, is that what you mean "tale of the tape".........measure?
    Yessir. Trust NOTHING. Test EVERYTHING. TRUST NOTHING. Measure twice/cut once, as the carpenters say.
    I don't paint bullets. I like Black Rifle Coffee. Sacred cows are always fair game. California is to the United States what Syria is to Russia and North Korea is to China/South Korea/Japan--a Hermit Kingdom detached from the real world and led by delusional maniacs, an economic and social basket case sustained by "foreign" aid so as to not lose military bases.

  13. #13
    Boolit Grand Master


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    Well you have to have the rifle to do that, he was looking for molds from Accurate so needed to find molds that cast large enough for standard groove diameter of cartridges he asked about. Listed as 42 caliber on that site.
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  14. #14
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    Quote Originally Posted by swheeler View Post
    The nominal bore diameter of US .416 barrels is .408, groove is +.008
    These are the dimensions of my .416 Taylor Shilen barrel. I can`t see much reason for a cartridge larger than the Taylor for anything that exists on the N. American continent and most likely also Africa or Asia.Robert

  15. #15
    Boolit Master Oklahoma Rebel's Avatar
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    yes, when I said bore I meant groove, kinda like when I say floor I mean wall. hehehe, swheeler, that's a kind offer, and pretty tempting, but with the amount of powder those use, it would put me in the poor house!, I've got my heart set on the 9.3X62, well see if that is big enough for me, and the hogs and deer! thanks!-Travis P.S. how you doing 9.3Al?
    An armed man in a citizen.
    An unarmed man is a subject.
    A disarmed man is a slave.

  16. #16
    Boolit Grand Master
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    Not too bad, sir. SWMBO is going back to Spain in a couple weeks, and with the cooler weather I'm getting caught up on long-delayed reloading projects. Might even get the furnace warmed up soon, and cast with a few new moulds--one of those in 9.3mm.
    I don't paint bullets. I like Black Rifle Coffee. Sacred cows are always fair game. California is to the United States what Syria is to Russia and North Korea is to China/South Korea/Japan--a Hermit Kingdom detached from the real world and led by delusional maniacs, an economic and social basket case sustained by "foreign" aid so as to not lose military bases.

  17. #17
    Boolit Master Oklahoma Rebel's Avatar
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    ok, I've seen that used before, what does "SWMBO" stand for? I know I'm gonna slap my forehead and say duh! but had to ask! oh, what new mold did'ja get?
    An armed man in a citizen.
    An unarmed man is a subject.
    A disarmed man is a slave.

  18. #18
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    Artful told us it stands for She Who Must Be Obeyed!

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  19. #19
    Boolit Grand Master


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    Quote Originally Posted by Hardcast416taylor View Post
    These are the dimensions of my .416 Taylor Shilen barrel. I can`t see much reason for a cartridge larger than the Taylor for anything that exists on the N. American continent and most likely also Africa or Asia.Robert
    Right on! That will be the dimensions of 99.9% of the barrels from any reputable manufacturer, maybe choked a few one ten thousands at the muzzle.
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  20. #20
    Boolit Master Oklahoma Rebel's Avatar
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    lol, that she must! thanks for all the info!
    An armed man in a citizen.
    An unarmed man is a subject.
    A disarmed man is a slave.

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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
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LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check