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7mm-300 winmag

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Old 08-16-2009, 07:05 PM
Junior Member
Join Date: Jul 2007
Posts: 9
7mm-300 winmag

I am in the process of a new build chambered in a high performance 7mm round. I would like to know if any of you out there have any real world experience with this cartridge, I will be shooting 162 grn amax for varmints and 180 grain berger for big game. I believe that I could achieve 7stw velocitys with less powder and also be able to seat the vlds out to the lands and still fit in the magazine.
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Old 08-16-2009, 08:43 PM
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Join Date: Jan 2003
Location: The rifle range, or archery range or behind the computer in Alaska
Posts: 3,515
Re: 7mm-300 winmag

The 300 winnie and the 7mm Rem mag cases are VERY close in design. It is alot of headache and expense to go with a wild cat that offers such little performance gains IF any over a readily available cartridge. If you want a 7mm wild cat, dont joke around. Use a bigger case.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.
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Old 08-16-2009, 10:39 PM
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Join Date: Jun 2008
Location: Jackson Ms
Posts: 314
Re: 7mm-300 winmag

My seven mag will pust 180g Bergers at 2950-2970fps. It works for me because the bullet specturm is what I need. It is hard to increase velocity without increasing powder or using harder brass.

I'd get the STW.
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Old 08-17-2009, 03:31 AM
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Join Date: Jan 2006
Location: South Africa
Posts: 420
Re: 7mm-300 winmag

You may search for the .280 or .284 Jarrett (or 7mm Jarrett?) - I think that was basically what he designed using the 300 WM case. He claimed it was very efficient as I recall.
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Old 08-17-2009, 10:35 AM
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Join Date: Mar 2002
Location: Wyoming
Posts: 2,615
Re: 7mm-300 winmag

Michael E is right on the money with his advice. Why not just get a 7mm STW and outperform what you will go through quite a bit of trouble to build. I have shot the 7mm-300 wby and the now named 7mm STW since the mid 70's and they are great 7mm's that will outperform what you are looking at. The 7mm-300 ultramags I did just went through barrels to quick but were very good long rangers with heavy bullets such as the 200 grain Wildcat and 180 Bergers. I decided from a lot of testing the 7mm-300 wby and the 7STW were about the best it got in 7mm before barrel wear got to be to much of a factor.
Predictions are difficult, especially when they involve the future
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Old 08-17-2009, 11:01 AM
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Join Date: May 2005
Location: El Reno,Ok.
Posts: 230
Re: 7mm-300 winmag

Up until the loss of 300win Lapua and RWS brass, I had considered a wildcat similar to this. Check out this write-up on the 284 jarrett, pretty much dups stw velocities with less powder. With the strong brass it could of been something.

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Old 08-18-2009, 01:04 AM
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Join Date: Jan 2006
Location: South Africa
Posts: 420
Re: 7mm-300 winmag


I thought RWS Brass was still available in 300 WM. I do see Huntingtons no longer stocks them. Is that the end of it?

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