Action Question

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by wmag79, Mar 28, 2013.

  1. wmag79

    wmag79 Active Member

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    I want to build a custom 378 Weatherby Mag. Which actions can I use? Any custom or factory actions? Where can I get one?gun)
     
  2. MudRunner2005

    MudRunner2005 Well-Known Member

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    I would suggest finding a Weatherby Mark-V action that was previously for a .378 case round and using it...Such as .30-378, .338-378, or .378 Wby. not sure, but the larger caliber Weatherby might be based off the same parent case, but I'm not positive.
     

  3. wmag79

    wmag79 Active Member

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    I like the weatherby actions but I am curious if any other actions are capable of handling it.
     
  4. MudRunner2005

    MudRunner2005 Well-Known Member

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    I am a big fan of the Mark-V actions as well. I love the 60* bolt-throw. I have a Mark-V AccuMark in .257 Wby Mag, and it's one smooth shooter. I want another AccuMark in .30-378 Wby just for fun.

    Well, there's alot of guys building custom .338 Lapua's on trued Remington 700 magnum actions, and having great success with them. So I would assume that it would be able to handle the .378 Wby as well. Plus, the 700's are a tried & true action. Parts are readily available. And every smith knows how to true one of them up. Personally, I'm a huge Rem 700 fan. Alot of guys on here aren't for some reason. I've always have good experiences with them over the years.
     
  5. wmag79

    wmag79 Active Member

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    I am actually researching the m700 ultra mag action. I am not having much luck finding anyone who has built a 378 on anything other than weatherby actions. I am still hoping more possibilities out there to build on.
     
  6. MontanaRifleman

    MontanaRifleman Well-Known Member

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    For what purpose are you building this rifle?
     
  7. wmag79

    wmag79 Active Member

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    I am building the rifle for a couple big game hunting trips we are scheduling as well as pretty much one upping my two buddies who have 375 h&h and brag endlessly.
     
  8. MudRunner2005

    MudRunner2005 Well-Known Member

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    You should go for the .30-378 Wby Mag if you wanna 1-up them. It's a monster. Make sure you put a radial brake on the skinny end.
     
  9. MontanaRifleman

    MontanaRifleman Well-Known Member

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    I'm guessing by "hunting" you don't mean Long Range Hunting? The 375 Ruger has greater case capacity than the H&H and the 375 RUM has greater case capacity than the Ruger. If I was picking a 375 "hunting" round for large game, say out to 400 yds or so, I would pick one of these. My first choice of action for any 375 build would be a custom. After that it would be a Mark V or 700. In the case of the 700, I would replace the bolt and recoil lug.

    A 378 Wby would top the heap of common factory cartridges but very spendy compared to the the RUM or Ruger. If you went with the 378 I would recommend a custom action first followed by the Mark V.

    My smith who is currently building a 300 RUM on a 700 action for me is a big Mark V and 378 series fan. He has done hundreds of them.

    If I was going to build that class fo 375, I would do a 338 Lapua Imp version on a custom action. I would not do a Lapua class cartridge on a factory action and if I did, it would be a Mark V.

    For a LR 375, I would look at 408 Cheytac or something in that class like a 375 AM.
     
  10. wmag79

    wmag79 Active Member

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    I am set on the 378 wby. I am aware that it may not be the greatest choice for L.R. or at least not much over 500-600yds. However that is not my concern for this gun. I want it to stop a Buick in its tracks and look good doing it. I have two long range rifles at this time chambered in 257 Wby. and 300 RUM. My next project will be 338-378 Wby. which will be built matching the 378. I have did a little research on 408 and as impressive as it is I am turned off by the availability of components for it as well as the service of the company.
     
  11. bb204

    bb204 Well-Known Member

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    A Stiller TAC 338 action has a bolt face that will work. That's what I used.
    Good Luck.
     
  12. wmag79

    wmag79 Active Member

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    I checked on the Stiller tac 338 action this afternoon. I also checked with Montana rifles and will most likely go with them unless I can locate a stainless mark v action.