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338WSM; 300 or 7mm parent case

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Unread 09-29-2010, 02:17 AM
Silver Member
Join Date: Jan 2010
Location: Willamette Vally
Posts: 108
Re: 338WSM; 300 or 7mm parent case

Win mag I thought Skip was talking about using the straight 325WSM, I get how using the 325 case would be real easy to neck up and I am considering that option seriously. 300 and 325 cases have the same length from the base to the origin of the shoulder (i think, I'll have to double check that one). If so then the 338-300 and 338-325 are really the same animal. Is Winchester/Olin the only manufacturer of 325 brass? I may be persuaded by the Norma brass for the 300. Once again thanks for all the help guys. Oh and don't hold your breath to see results as I am a regular guy with a regular job. I will be getting the action shortly then I need to wait a little bit before I call McMillan, wait a real long time, get a Jewell trigger, match striker assembly, and Wyatts extended mag box, wait some more and find a smith to chamber it all up for me. Anybody have any work done by Darrell Holland. He is in my state and I am considering him but haven't heard much from his customers. Kirby Allen or Shawn Carlock would do an out standing job I have no doubt.
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Unread 09-29-2010, 04:05 AM
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Join Date: Nov 2008
Location: Nelson, New Zealand
Posts: 368
Re: 338WSM; 300 or 7mm parent case

I am in the process of building a 338-7mmwsm.
I had a 7mmwsm & have sold it but I still have a lot of brass new & fired as well as the dies.
No one wanted to buy the brass & dies so I thought I would use it to build a small 338.
I already have an Edge & a Lapua, which is going to be an AI very soon & I have another Std Lapua coming, so I thought why not be greedy & make a WSM
The 7mmwsm brass is longer to the shoulder than the 300 & I have already modified my dies & have formed some cases with very little trouble.
I will be firing 160-225 bullets but I'm sure I won't be able to help myself & I will try some 300s
The donor rifle only has a 24" barrel so velocities won't be outstanding but then they don't have too be.
If it works I may build a better one out of other bits & pieces I have that are waiting to be used.
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Unread 09-29-2010, 04:38 AM
Junior Member
Join Date: Sep 2010
Location: Australia
Posts: 21
Re: 338WSM; 300 or 7mm parent case

I did say use the .325 WSM instead of a wild cat but I did not realise you already had a .338 barrel to work with.

But I did also say that the .325 WSM would be a better option for necking a WSM cases to .338.

Sorry for any confusion.

Problem with the WSMs I have found is the weight of the bullet is limited because of its length reducing powder capacity. If you have a longer action then you should be able to get around this problem.
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Unread 09-30-2010, 12:14 AM
Silver Member
Join Date: Jan 2010
Location: Willamette Vally
Posts: 108
Re: 338WSM; 300 or 7mm parent case

I plan on using a Wyatts extended magazine box so 3.000 inches shoulden't be a problem and I don't plan on using the really long 338 bullets. How is the 325 brass quality wise? Just sort and cull as needed to be good to go?
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