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338?

 
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  #36  
Old 04-11-2009, 05:37 AM
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Re: 338?

I understand your explaination of surface area and exerted pressure on that area, but do you not assume that a .750 bolt has larger (thicker) lugs than a .700 bolt. I don't know if that is true, and if so , if you still use a 1.350 dia. receiver, how are you gaining anything? Why is it that BAT Model M action can use a .717 bolt on the 408 Chey-Tac case, is it due to the receiver being 1.450, and not related so much to the diameter of the bolt ? Also, would you concider a 338 Lapua a safer build on a custom action ,like Phoenix , with a .700 bolt than on a standard Rem action ?
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  #37  
Old 04-11-2009, 05:49 AM
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Re: 338?

Thanks for clarifying what i was saying about the pressures phorwath. As for the other custom actions a lot of them have larger lugs and they have a lot higher sheer strength than a standard Rem700. the Lawton 7000 for example has a lot stronger bolt and also the recoil lugs inside the action have a lot higher sheer strength even though both actions have 1.360" diameter and .700 diameter bolts the Lawton is a LOT stronger than the Remington. It all comes down to sher strength. As for the BAT actions i am unsure of the diameter of the bolt but i am sure it has much larger lugs inside the action and on the bolt. Also the Rem Bolts are 2 piece the boltheads are pinned to the bolt tube where most custom bolts are 1 piece making them stronger.

I understand why people think that two actions the same diameter same diameter bolts should be as strong as each other they just are not.

Cheers Bill
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  #38  
Old 04-11-2009, 08:04 AM
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Re: 338?

K whos a good source for a 30" .338 barrel?
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  #39  
Old 04-11-2009, 08:33 AM
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Re: 338?

The greater the diameter of the case body the greater the rearward thrust, that is a given. But the fact remains there are plenty of the countries top gunsmiths that will build the 338 Lapua as well as 338/378, and 378 Wea, on a M-700 action even in SS

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Last edited by jwp475; 04-11-2009 at 08:47 AM.
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  #40  
Old 04-11-2009, 11:42 AM
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Re: 338?

The following quote is by Dan Lilja

"Several years ago I wrote an article for Precision Shooting that determined bolt lug strength for a given bolt size and material strength. There was included in the article a computer code that also calculated bolt thrust developed from various cartridges. If we run the numbers through the program for our example here, the 378 Weatherby case and a standard Remington 700 action, we find that the bolt thrust value is about 12,760 pounds for a stiff handload (and whose aren't?) of 65,000 PSI. The lug strength value is greater (thankfully) at about 37,770."



I'd safety that's enough safety margin, of course the fact that there is a ot of 700's built in 338 Lapua and are working just fine must mean something, don't you think
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Last edited by jwp475; 04-11-2009 at 12:13 PM.
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