The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Bolt, Lever, and Pump Action

Thread Tools Search this Thread
Old January 19, 2014, 02:08 AM   #1
Senior Member
Join Date: August 13, 2011
Location: Seattle area
Posts: 659
Weatherby Mark 5

so nine locking lugs? is it really that much more efficient than the traditional two or three lug bolt?
There just doesn't seem to be as much "lug surface contact" .
I don't know the pressures of the "Weatherby Magnums", but are they significantly higher than the standard magnums?
tahoe2 is offline  
Old January 19, 2014, 02:31 PM   #2
Senior Member
Join Date: April 26, 2010
Location: Yellowstone Co, MT
Posts: 422
I own a MKV, left to me by my uncle, a gunsmith. He educated me on the features of the MKV vs all the rest.

The two opposing locking lugs of most conventional rifles require a lot of material to be removed from the barrel to accommodate the large locking lugs. The bolt is smaller in diameter than the MKV bolt.

The MKV bolt is the same diameter of the 9 locking lugs, arranged in three rows of three.

The MKV action is widely accepted to be the strongest action available. It has proof tested conditions that destroyed every other action tested. The test was, place a 180 gr bullet a few inches into a 300 WBY barrel, from the breech, load an other 180gr hot load, and shoot. In this test, both bullets were swaged and exited the barrel. The action was damaged, it had swollen by .003", and required a gunsmith to open. Every other rifle tested, all of them you or I could name, split like ruptured banana in front of the receiver for about 10-12". This reduced the forend of the stock into schrapnel and would have maimed if not killed the shooter. The receivers and actions were ruined and most bolts failed in this test.

Roy Weatherby is supposed to have gotten the idea for the bolt from artillery receiver blocks. These blocks feature an interrupted screw design that required less travel to engage and to disengage.

The design was praised to me by my gunsmith uncle, and he left me a 340WBY MKV Deluxe, circa 1972. So, I may not be very objective about this action. God Bless you Uncle Bill!

Having the receiver portion of the barrel and the bolt, the same diameter, while heavier, has no less contact, than dual opposed locking lugs. I believe that it has been verified that it is the strongest available.
handlerer2 is offline  
Old January 19, 2014, 04:18 PM   #3
Senior Member
Join Date: December 10, 2012
Posts: 3,896
There is much more surface area contact than with the 2 lug design. The amount of lug material is about the same, but but by contacting in three rows, the amount of lug touching action is greater. There have been ammo offerings over the years that WBY labeled "Mark V only."
reynolds357 is offline  
Old January 19, 2014, 06:43 PM   #4
Senior Member
Join Date: September 8, 2007
Location: Mississippi
Posts: 14,495
The nine locking lugs also give the mark V a 54 degree bolt lift instead of the usual 90 degree lift.
Hawg is offline  
Old January 20, 2014, 09:54 AM   #5
Senior Member
Join Date: October 24, 2010
Location: Austin, Texas
Posts: 3,318
I had a German lefty mk v in .30-06 Springfield. Sub 1" groups at 100 yards with 3 shots from a cold barrel. After that the thin barrel heated up and the groups would open up a little bit. With that rifle I killed, deer, black bear, 1 charging lion, 1 leopard, many assorted African antelope and a couple of wart hogs and zebras. I lost it when my dad sold his ranch in Mexico. I wish I still had it.

Don't let anyone ever tell you the .30-06 can't do it all.

I've also seen a .460 Wby mk v drop a charging elephant dead before he hit the ground from a brain shot.

I still prefer claw extractor positive extraction bolt actions like the classic Mauser or Winchester model 70.
kcub is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -5. The time now is 08:37 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2018 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.05016 seconds with 7 queries