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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: 3,418
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.
Originally Posted by Broz View Post
Please just answer one very simple question. Why would anyone shooting long range load a low BC , low SD 168 gr offering in a 300 win???????

My answer to this is. The only reason is to make the 7 RM look good. There is no other reason.

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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
Silver Member
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: 218
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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