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Old January 19, 2014, 02:08 AM   #1
tahoe2
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Join Date: August 13, 2011
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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?
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Old January 19, 2014, 02:31 PM   #2
handlerer2
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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.
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Old January 19, 2014, 04:18 PM   #3
reynolds357
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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."
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Old January 19, 2014, 06:43 PM   #4
Hawg Haggen
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The nine locking lugs also give the mark V a 54 degree bolt lift instead of the usual 90 degree lift.
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Old January 20, 2014, 09:54 AM   #5
kcub
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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.
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