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Weatherby Action Length?

 
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  #1  
Old 04-14-2010, 12:49 AM
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Weatherby Action Length?

I was wondering if all the weatherby mark V magnum actions are all the same length? Like for example is the 7mm action the same length as the .338-378 action? Thanks
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Old 04-14-2010, 01:41 AM
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Re: Weatherby Action Length?

Exact same action. The groove in the bottom of the bolt is different for the different throw of the shorter 7mm but it can be easily lengthenned. Open up the bolt face to the 378 and get a 378 magazine.
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Old 04-14-2010, 06:11 AM
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Re: Weatherby Action Length?

I never see any decent priced Weatherby Mark 5s. Seems like you have to buy a Wthby Mark 5 Rifle and then scarf up the action for custum build. At those costs it almost seems like the better route is to buy a custom action. No? Or do the custom actions that will handle the 378 Wthby class cartridges even more expensive than buyin a donor Wthby Mark 5?

Last edited by phorwath; 04-14-2010 at 12:15 PM.
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Old 04-14-2010, 06:39 AM
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Re: Weatherby Action Length?

May be a bit 'off thread', but, I'm not impressed with the 'engineering' in Weatherby Mk5 actions. IMHO, there are better commercial actions for customs available and you can get about anything you might want in a custom action, if you're willing to wait.
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Old 04-14-2010, 09:00 AM
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Re: Weatherby Action Length?

I'm not actually wanting to build, just want to install the longer box magazine in my 7mm so I can seat bullets to the lands. LTLR, how do I do it, probably need a smith right? Thanks for all the replies!
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Old 04-14-2010, 01:06 PM
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Re: Weatherby Action Length?

Weatherby chambers have extremely long throats. Have you set a round yet so you have an OAL? (the Pacific/Stoney point OAL gage is a useful tool). Ya', you'll need a gunsmith.
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Old 04-14-2010, 03:19 PM
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Re: Weatherby Action Length?

If it is a mk 5 with standard freebore it will take an extremely long heavy bullet to reach the lands and not run out of the case first. You can get a gunsmith to change it though and allow you to seat the bullet way out there. He would have to lengthen the channel in the bottom of the bolt to 300 wby length so it would go back for enough to pick up the longer rounds. Also take out the 257,270, 7mm magazine and install the one for the 300 and 340 wbys. That is easy, you can do that. But need a lathe to cut the bolt channel. I have done the 7mm wby's from a 300 wby and they have the ability to seat the bullets way out there. You would be changing yours from 7mm to 300 basically except for the barrel. Should not be very expensive at all to make that little cut that will allow your bolt to slide back to 300 wby length. I build everything I can on the wby mk 5 action because it is far and away the best action on the market for custom work unless you get a custom action. I look for the wby synthetics at used prices and pick them up in the $400-$500 range. I love these guys on the forums that run down these actions and cause guys to dump there mk 5 actions for nothing. I have benefitted greatly from that and strongly encourage all the wby bashing they can bring. Saves me a lot of money to get the best there is out there.
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