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338WSM; 300 or 7mm parent case

 
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  #1  
Old 09-28-2010, 02:29 AM
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338WSM; 300 or 7mm parent case

I want to put together a rifle in the wildcat cambering of 338 WSM. I know that it isn't a long range hammer but it would meet a few needs(wants) that I have. See what the WSM family is all about, fill a caliber gap in my safe, use some rifle components I have laying around, simple way to get into wildcat cartridges with out being too exotic. I don't know if I want to use the 300wsm case as the parent or to use the 7WSM with its ever so slightly longer body and I am assuming a smidgen more capacity. What I want to do is push 210-225 grain bullets out of a 28 inch barrel at close to 3000fps. I know Kirby Allen has an XP chambered as such and would welcome his input as well as any of the other extremely knowledgeable people who frequent this board. If you don't lump yourself into the extremely knowledgeable category but have something to say by all means do so. Everyone's help is very much appreciated.
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Old 09-28-2010, 02:53 AM
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Re: 338WSM; 300 or 7mm parent case

What about using the .325 WSM case? Or just use it instead?
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Old 09-28-2010, 09:55 AM
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Re: 338WSM; 300 or 7mm parent case

You are correct about the ever so slightly larger 7wsm case, however I think what skip just posted makes the most sense for necking up, 325wsm makes more sense. .284 to .338 would be very hard on a case neck. .308 to .338 is more easily achieved, but (325wsm/8mm) .323 to .338 is one pass thru the die, and I would think that would promote much better case life and ease you into wildcatting with a few less steps.
Ive thought about this very project, and that is what I would do if it were me. Unfortunately I dont currently have the funds to give it a go, or Id try one with you.
Looking forward to seeing how it turns out. Good Luck
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Old 09-28-2010, 09:05 PM
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Re: 338WSM; 300 or 7mm parent case

I've heard lots of good things about the 325 WSM but I already have a rock creek 338 barrel laying about and want to use it. That and it isn't a wildcat which for some reason I really want for my next rifle. What about a 338-300 WSM improved to the 7WSM body length. Fire forming would be necessary and I'm not sure I want to go that far yet, or if it would even make enough of an improvement to be worth it.
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Old 09-28-2010, 09:33 PM
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Re: 338WSM; 300 or 7mm parent case

No no no, I meant neck the 325wsm brass(wich is .323) up to .338 cal. Its still a wild cat 338, and you can use your barrel, but its just alot easier on case necks to go from big(323) to bigger(338) vs. small(284) to big(338).

It would be for all intents and purposes a 338-325shortmag
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  #6  
Old 09-28-2010, 09:36 PM
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Re: 338WSM; 300 or 7mm parent case

I'm pretty sure I have been told that the 300WSM has a longer neck than the 7WSM.
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  #7  
Old 09-28-2010, 09:47 PM
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Re: 338WSM; 300 or 7mm parent case

Quote:
Originally Posted by bb204 View Post
I'm pretty sure I have been told that the 300WSM has a longer neck than the 7WSM.
That's correct, but the 7mm case has more powder capacity.
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