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338 LM improved, 338/300 RUM, 338/416

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Unread 01-23-2007, 12:17 AM
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Re: 338 LM improved, 338/300 RUM, 338/416

Depending on what degree of improving the wildcat design has you could see as little as 25 fps velocity gain or as high as 100 fps on this case. That said, the only way to get the upper end velocity gains is to reduce body taper to an absolute minimun which gives slightly more case capacity but at a cost of feeding and extracting with high pressure loads.

I would also like to agree with Uncle B. with these larger cases, after a few firings, the cases really lose their abilty to be sized easily and even a slight bump on the shoulder to get it back just enough for easy chambering can result in a colapsed shoulder.

A good neck and shoulder anneal can help this but with the smaller advantage in velocity you get I would really recommend the same and stay less then 40 degrees in shoulder angle.

Kirby Allen(50)
Kirby Allen(50)

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Unread 01-23-2007, 07:26 AM
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Re: 338 LM improved, 338/300 RUM, 338/416

What about a 338 edge with an improved shoulder? Anybody do any of these?

[/ QUOTE ]

Hi i am in the process of building a 338 WBX it has a 60 degree shoulder.

I have spoken to JD Jones about ti and their are a few tircks to make it work well he has a lot of cartriges based on a 60 degree shoulder for his TC Encore hand cannons and does not have any problems.

Cheers Bill
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Unread 01-23-2007, 04:27 PM
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Join Date: Oct 2006
Posts: 862
Re: 338 LM improved, 338/300 RUM, 338/416

I could be wrong here but they don't run the pressures as high in the encore as in most bolt guns. That would make sizing much easier but lose most of the gain of improving the case capacity.
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