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Handloader
- Dec 26, 2007
- 4,973
- 8
I own or have owned the following make of bolt action rifles and more than one in the following makes. Remington, Ruger, Savage, Interarms Mauser, Winchester, Sako, Tikka, Browning, Marlin, Howa, and Weahterby (Vanguard and Mark V). The reason that I lean in favor of the Weahterby Mark V has to do with how it is made, looks and feel.
The Mark V action is made in the following way. The nine lugs are machined on a lathe. Those lugs are cut one row (3 lugs) at a time. Same with the lug seat in the receiver. They are done on a broach one row at a time. There is no way to get some of the lugs in one row or one lug in each row or whatever to NOT make contact. It is a all or nothing type of deal.
The shear area of the Mark V is similar to two lug actions like M70 and Rem 700. I think it is slightly smaller than the Rem 700.
However, bearing area is much larger. If all nine lugs are not touching they will be touching with a huge over load. Of course the same applies to two lug actions.
To illustrate the issue of bearing area consider a two lug action like a Rem 700. Now imagine a slot equal to half the the length of the locking lug is machined out from the middle of each lug. That would make the Rem 700 a 4 lug action and in the process would double the bearing area but reduce the shear area.
The amount of shear area has it limits for two reasons. Firstly, no matter how long the locking lug is the locking recesses will set limits. Secondly, even if the lugs were a foot long they would still compress and set back at the point where the lug bears.
If you look at the breech of artillery and naval guns you will see that the lock up system is an interrupted thread and an interrupted thread is what a Mark V uses.
So speaking of bearing area the 9 lug system - the bottom line is that there is more bearing area because there IS more bearing area...
There is no comparison the Mark V is a stronger and better action period.
Now just for a little extra - You need to multiply the base area of the lug where it is machined out of the bolt. This will give sheer area. If you find out the area you will find why the military uses this breach system instead of a 2 or 3 lug system. I dare any one to put any rifle or make through the same tests Roy Weatherby did while developing the Mark V. This is true testimony to the shear strength of it. If any one isn't aware of how he tested it, here it is. He jammed a bullet up in the barrel (several times of varying weights) then loaded a live round behind it and sent it down range. Did you get that, he sent the bullet and bullets down range. The Mark V took it and did not give.
But more than anything it is like Ford, Chevy, or Dodge, I just like to shoot and hunt with a Mark V.
The Mark V action is made in the following way. The nine lugs are machined on a lathe. Those lugs are cut one row (3 lugs) at a time. Same with the lug seat in the receiver. They are done on a broach one row at a time. There is no way to get some of the lugs in one row or one lug in each row or whatever to NOT make contact. It is a all or nothing type of deal.
The shear area of the Mark V is similar to two lug actions like M70 and Rem 700. I think it is slightly smaller than the Rem 700.
However, bearing area is much larger. If all nine lugs are not touching they will be touching with a huge over load. Of course the same applies to two lug actions.
To illustrate the issue of bearing area consider a two lug action like a Rem 700. Now imagine a slot equal to half the the length of the locking lug is machined out from the middle of each lug. That would make the Rem 700 a 4 lug action and in the process would double the bearing area but reduce the shear area.
The amount of shear area has it limits for two reasons. Firstly, no matter how long the locking lug is the locking recesses will set limits. Secondly, even if the lugs were a foot long they would still compress and set back at the point where the lug bears.
If you look at the breech of artillery and naval guns you will see that the lock up system is an interrupted thread and an interrupted thread is what a Mark V uses.
So speaking of bearing area the 9 lug system - the bottom line is that there is more bearing area because there IS more bearing area...
There is no comparison the Mark V is a stronger and better action period.
Now just for a little extra - You need to multiply the base area of the lug where it is machined out of the bolt. This will give sheer area. If you find out the area you will find why the military uses this breach system instead of a 2 or 3 lug system. I dare any one to put any rifle or make through the same tests Roy Weatherby did while developing the Mark V. This is true testimony to the shear strength of it. If any one isn't aware of how he tested it, here it is. He jammed a bullet up in the barrel (several times of varying weights) then loaded a live round behind it and sent it down range. Did you get that, he sent the bullet and bullets down range. The Mark V took it and did not give.
But more than anything it is like Ford, Chevy, or Dodge, I just like to shoot and hunt with a Mark V.