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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma mag or 30 Nos
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<blockquote data-quote="Edd" data-source="post: 1521388" data-attributes="member: 30592"><p>Here is Jim Borden's opinion............</p><p></p><p>I have had numerous requests for either rifles built in 338 Lapua or actions for the 338 Lapua. Currently, I do not make my standard actions (Timberline, Timberline Magnum or Rimrock LSR) to accept the 338 Lapua case. I have two primary concerns about making the actions at their current dimensions to accept the 338 Lapua round. The first concern is that the bolt nose edges on a .7000 diameter bolt will be very thin and fragile with a 338 Lapua Boltface (.595) and the lug shear area even though it is greater than a Rem 700 seems marginal to me for the 338 Lapua and its bolt thrust. The second area of concern is the thread tenon diameter. The actions have a 1 1/16x18 thread and the barrel would be threaded the same. The root diameter of a 1 1/16x18 thread is about .990 inch. With a chamber diameter of .595, this leaves a wall thickness of .1975. Using a simple of model of the tenon alone and Chamber pressures of 65,000 psi results in a hoop tensile stress in the barrel tenon of 94,000 psi. The yield strength of 416R Stainless steel at 26 Rc is about 107,000 psi. So the SF (Safety Factor) for this application is only 1.1 which is well below what is recommended minimum of 1.5.</p></blockquote><p></p>
[QUOTE="Edd, post: 1521388, member: 30592"] Here is Jim Borden's opinion............ I have had numerous requests for either rifles built in 338 Lapua or actions for the 338 Lapua. Currently, I do not make my standard actions (Timberline, Timberline Magnum or Rimrock LSR) to accept the 338 Lapua case. I have two primary concerns about making the actions at their current dimensions to accept the 338 Lapua round. The first concern is that the bolt nose edges on a .7000 diameter bolt will be very thin and fragile with a 338 Lapua Boltface (.595) and the lug shear area even though it is greater than a Rem 700 seems marginal to me for the 338 Lapua and its bolt thrust. The second area of concern is the thread tenon diameter. The actions have a 1 1/16x18 thread and the barrel would be threaded the same. The root diameter of a 1 1/16x18 thread is about .990 inch. With a chamber diameter of .595, this leaves a wall thickness of .1975. Using a simple of model of the tenon alone and Chamber pressures of 65,000 psi results in a hoop tensile stress in the barrel tenon of 94,000 psi. The yield strength of 416R Stainless steel at 26 Rc is about 107,000 psi. So the SF (Safety Factor) for this application is only 1.1 which is well below what is recommended minimum of 1.5. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
300 Norma mag or 30 Nos
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