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my new 7mmx300win

 
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  #29  
Old 09-20-2013, 10:46 AM
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Location: Ashflat, AR
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Re: my new 7mmx300win

The 7mm rem mag is a shorter case.
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  #30  
Old 09-20-2013, 10:47 AM
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Join Date: Jul 2012
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Re: my new 7mmx300win

Quote:
Originally Posted by 300whisper View Post
Alright guys please forgive my newbness here and I don't mean to thread high jack, but the 7mmRM is based on the 375H&H as a parent case and so is the 300WM. So, isn't a 7mmRM the same as a 7mmx300WM? Is there a steeper shoulder or more/less taper on the case? I agree with major that those published FPS fills a nice niche but where does that extra velocity to edge out the 7mmRM come from? I see why the OP built his rifle on this round bc I am now really interested in it as well. Thanks guys.
This round is a 300win mag case with the same shoulder angles, just necked down to 7mm. I really simple wildcat really. You are correct about the cases, but the 300win mag's dimensions allow for just a little bit more case capacity that seems to give those 180's just a hair of a boost. For instance I rund 71.5gr of H1000 for my 168 bergers, this is over max by hodgdon standards. I coudl probably only get another grain at the most of powder in that case. With the 7/300, with the same powder, I have read guys using 76-79gr of the same powder. The case is just big enough to give you that little extra boost, plus there have been pretty good reports of barrel life from this gun. Doesn't seem to be too wild of a barrel burner from what I am understanding. Hopefully this clarifies a few questions for you.
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  #31  
Old 09-20-2013, 02:21 PM
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Join Date: May 2012
Location: Central Missouri
Posts: 502
Re: my new 7mmx300win

Thank you...yeah I was definitely over analyzing it. Cummin_un_glued said it in the simplest terms possible, but I was too dumb to catch on till your explanation. Awesome rifle once again, and I am excited to see more results once it gets further dialed in.
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  #32  
Old 09-20-2013, 02:56 PM
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Join Date: Nov 2010
Location: Ashflat, AR
Posts: 385
Re: my new 7mmx300win

Quote:
Originally Posted by 300whisper View Post
Thank you...yeah I was definitely over analyzing it. Cummin_un_glued said it in the simplest terms possible, but I was too dumb to catch on till your explanation. Awesome rifle once again, and I am excited to see more results once it gets further dialed in.
I just picked up 6lbs of H1000 a little bit ago and I got about 500 bergers left so don't worry guys there will be plenty of shooting for me to share!
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Savage LRH 6.5x284
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  #33  
Old 09-20-2013, 05:10 PM
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Join Date: Jul 2010
Location: South FL
Posts: 76
Re: my new 7mmx300win

Quote:
Originally Posted by fmajor View Post
Would you share what parameters on your "Valkyrie" are different from the "standard" 7mm-300 Win Mag wildcat?
Basically, it's a 7-300 with a 37deg shoulder and a very slight blow-out of the body from .489 to .496 at the body-shoulder junction. The freebore is also tweaked to permit longer OAL.

Lots more here, second post down:
Anyone own a 7mm 300 Win Mag?
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  #34  
Old 09-20-2013, 06:52 PM
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Join Date: Oct 2009
Location: USA
Posts: 320
Re: my new 7mmx300win

Quote:
Originally Posted by chuckhammer View Post
Basically, it's a 7-300 with a 37deg shoulder and a very slight blow-out of the body from .489 to .496 at the body-shoulder junction. The freebore is also tweaked to permit longer OAL.

Lots more here, second post down:
Anyone own a 7mm 300 Win Mag?
Oh now that looks truly lovely!!! Very similar size/capacity of 7mm-300 Win Mag - what a great design. Do you experience an appreciable performance increase or more negligible?
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  #35  
Old 09-20-2013, 06:52 PM
Silver Member
 
Join Date: Nov 2010
Location: Ashflat, AR
Posts: 385
Re: my new 7mmx300win

Quote:
Originally Posted by chuckhammer View Post
Basically, it's a 7-300 with a 37deg shoulder and a very slight blow-out of the body from .489 to .496 at the body-shoulder junction. The freebore is also tweaked to permit longer OAL.

Lots more here, second post down:
Anyone own a 7mm 300 Win Mag?
what exactly do you hope to gain over the standard 300 case?
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Weatherby Vanguard 7mmx300win
Weatherby Vanguard 277 Magnum (awaiting assembly)
Weatherby Vanguard 257wby
Savage LRH 6.5x284
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