Bolt face diameter's

Discussion in 'Gunsmithing' started by J E Custom, Dec 13, 2008.

  1. J E Custom

    J E Custom Well-Known Member

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    Some times when considering a rebarrel and chamber or cartrige change you need to
    know what round will work without boltface and extractor work.

    I have a cheat sheet/ready reference and thought I would share it with every anyone
    that is interested.

    All of these groups of cartriges should interchange without bolt face and extractor
    work.( some work on recever rails may be needed to improve feeding ).

    As far as wild cats what ever the parent case was it should work in the action listed.

    I know this list is not complete but it's close.

    Short actions with a bolt face .Dia of .384 +/-
    17 Rem, 204 Ruger. 222 Rimingtion, and 223 Rem.

    Short actions with a bolt face .Dia of .470 +/-
    225 Winchester, 22/250 Remingtion, 6mm Norma BR, 243 Win, 250 Savage, 260 Rem,
    6.5/284 Norma, 7/08 Rem, 284 win, 300 Savage, 308 Win, 338 Federal, 35 Rem, and
    the 358 Winchester.

    Short actions with a bolt face .Dia of .540+/-
    223 WSSM, 243 WSSM, 25 WSSM, 7mm Rem saum, 7mm WSM, 300 Rem saum, 300
    WSM, 325 WSM, and the 350 Rem Mag.

    Long actions with a bolt face .DIA of .470 +/-
    220 Swift, 6mm Rem, 240 Weatherby Mag, 257 Roberts, 25-06 Rem,
    6.5x55 Swedish, 270 Win, 7x57 Mauser, 7x64 Brenneke, 280 Rem, 30/06 Springfield,
    8mm Mauser, 338/06 A Square, and the 35 Whelen.

    Long actions with a bolt face .Dia of .540 +/-
    257 Weatherby, 264 Win Mag, 270 weatherby Mag, 7mm Rem Mag, 7mm Weatherby Mag, 7 STW,
    7mm Rem Ultra Mag, 300 H & H, 300 Win Mag, 300 Weatherby Mag, 300 RUM, 303 Brit,
    8mm Rem Mag, 338 Win Mag, 340 Weatherby Mag, 338 RUM, 375 H & H, 375 Weatherby,
    375 RUM, 416 Rem Mag, 458 Win Mag, and the 458 Lott.

    Long actions with a bolt face .Dia of .585 +/-
    30/378 Weatherby, 338 Lapua, 338/378 Weatherby, 378 Weatherby mag, 416 Rigby,
    416 Weatherby Mag, 460 Weatherby Mag, and the 470 Nitro Express.

    I hope this information helps in deciding what your next build will be and minimize some
    of the cost.

    J E CUSTOM
     
    Last edited by a moderator: Dec 23, 2010
  2. cva54

    cva54 Well-Known Member

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    that was vary good I was going to do something like that but cant afford it going to re crown it. The question I got is? What does lapping the lugs do and what about a jeweled bolt
     

  3. eddybo

    eddybo Well-Known Member

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    Hey you forgot the PPC:)

    Thanks for the info, saves a lot of thinking, which in my case isnt a good idea:)
     
  4. J E Custom

    J E Custom Well-Known Member

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    Lapping the recoil lugs increases the contact to 100% between the bolt and the recever.
    this helps prevent the bolt from moving when fired and distributes the loading of the bolt
    and recever equally improving accuracy.

    It also smoothes the surface so the bolt will ingauge and dis-ingauge easer.

    But I don't recomend lapping unless you can lapp before final head space or you will increase
    head space to an unexceptable amount.

    If the head space "Is" tight then lapping will loosen it .

    Jeweling the bolt helps hold oil/lubricants on moving parts and also makes it look better.


    J E CUSTOM
     
  5. J E Custom

    J E Custom Well-Known Member

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    Thanks Eddybo !!!!

    The reason it's not on my list is because it is based on the old 220 russian case and falls
    between the bolt face dia of .384 and .470 ( it is .445 and is to loose in the .470 face )
    so you must open up the .384 to get proper extraction.

    Thanks
    J E CUSTOM
     
  6. TheHunt

    TheHunt Member

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    Thanks for posting this thread... Very useful
     
  7. Scott S

    Scott S Well-Known Member

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    J E -

    A quick question...what is the estimated cost to change a .540 bolt face to a .470 bolt face, say on a LA Winchester Model 70? I'm shopping for a Win Mod 70 stainless steel to build a 338-06 AI on and I'm finding a good many 7mm, 300 WM and .338 WM versions for sale. Not finding too many used SS 30-06, .270, 25-06, etc.

    Thanks!
     
  8. Dano1

    Dano1 Well-Known Member

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    Scott,

    You would actually have to replace the bolt. You can remove material from a bolt face, but cannot do the opposite.

    There are companies like PTG make replacement bolts for Remington push-feed rifles (700, etc...). You may want to contact them to see if they could manufacture a bolt for a Model 70. if it's a post 64 push-feed, I bet they could.

    I would definately wait for a .30-06 to come along to build off of if you are wanting a .338-06. The cost of a replacement bolt is very high.

    Savages are a good choice from going to a larger bolt face to a smalller one, they hace a pinned bolt that is able to trade the bolt head. A convenient and successful design.

    Dan
     
  9. J E Custom

    J E Custom Well-Known Member

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    Scott

    I would'nt consider any welding on the bolt face area because of the heat damage
    potential.

    Not much can go wrong with a mod 70 action so if you find a used hunting rifle the
    action should be in good shape ( Most hunting rifles will have less than a 1000
    rounds fired in them no matter how old they are).

    Find an action with the .540 bolt face and you will be set. Or depending on how much
    you have to pay for the action you might want to check on an after market bolt.

    When opening up a bolt face you don't change the metallurgy or the strength of the
    locking lugs .

    welding or soldering on the back of a bolt ( Like bolt handles )under controled conditions
    is ok because they don't take the stress that the recoil lugs and bolt face does.

    J E CUSTOM
     
  10. WildcatB

    WildcatB Well-Known Member

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    Thanks,

    Great information to have.

    Paul
     
    Last edited: Jan 14, 2009
  11. Scott S

    Scott S Well-Known Member

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    Thanks Dan & J E. I appreciate the responses. I don't have to have one today but I'd like to try to locate a used .270 or 30-06 to build the 338-06AI on in the next couple of months. I currently have a Win Mod 70 CRF featherweight in 30-06 but I want to keep it. Besides, it is a blued gun with wood stock and is a very nice rifle. I want to go with a stainless action and barrel this time with a composite stock. The 338-06AI will allow me to use my 30-06 brass and will also give me a good punch with a 200-250 gr .338 bullet.

    I like the Savage's but really prefer a CRF rifle and don't want to go with a Ruger. I've got about $1200 to go towards it, not counting the scope, so I hope to find a used rifle for about $600-$700.
     
  12. rm76

    rm76 Well-Known Member

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    Guys, on the Rem 700, can one simply swap bolt assemblies to go up or down in bolt face dimensions in the same action or is there something to prevent this? Of course the lugs would have to be lapped in the new action, but as long as a new barrel will be installed (and head spaced) afterwards, is there any other concerns that would make this undesirable?
     
  13. J E Custom

    J E Custom Well-Known Member

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    None as far as the bolt if it is a good fit and all the other work you mentioned is done.

    Depending on what round was used in the action you might have to open up the rails.

    J E CUSTOM
     
  14. rm76

    rm76 Well-Known Member

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    Thanks. Can you elaborate some on your last statement? What are the considerations for what rounds need an opening up of the rails and why?