7mm-300 Win Mag "7MM-WESTER"

Wild Monkey · Aug 17, 2024

Rummaging through the Pink Vault basement again.... I always had the desire for a 7mm-300 Win Mag. Most Shooters who build a straight neck-down version don't speak highly of it (for whatever reason). This version has a slightly longer neck. It utilizes the Weatherby double-radius design. Zero donuts are apparent. The Weatherby design forms the brass beautifully and makes it a natural creation. I have a Rem Mag barrel if I ever find a gunsmith willing to chamber it. "7mm-300 Weather-Chester" or "7-300 Wby-Win"? "7mm-Wester" it is. The photo shows 162 ELDX.

huntinfool18 · Aug 17, 2024

I did this exact thing about 10 years ago. Pretty identical performance as the straight 7-300win. I still have the reamer somewhere. I have a 6.5, .257 and 270 version as well but only played with the 6.5 version.

Playtimefun · Aug 17, 2024

Sexy as hell!!!!
Absolutely love the looks of it. Love my 300 mags and coming around to the 7 mms.

MagnumManiac · Aug 17, 2024

We played with 300 Weatherby brass to create 25, 6.5, 27 and 7 nearly 30 years ago now, all great performers, but it was right at the point when most dropped Weatherby brass from their line-up and it fizzled into history.
Seeing the resurgence in 6.5-300 Weatherby, all of these may need another look.

Cheers.

sw282 · Aug 17, 2024

Jarrett necked down a 300Win Mag to 7mm with a 35deg shoulder. Case capacity was halfway between 7Rem Mag and 7mmSTW. Folks order quite a few of them. Its called the 284 Jarrett

red6x6 · Aug 17, 2024

Check out 7mm Practical

http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

Ark. Trapper · Aug 17, 2024

The straight necked down version is an excellent round, and once upon a time, there were several members of this forum shooting them, including myself. I actually just chambered another one early last fall but haven't tinkered with it much yet. Most folks figure out that none of the bastardized versions offer enough performance gain to make them worth the extra trouble it takes to form cases. That round you have is a good-looking round, and I'd suspect you're just running the 300 case up into a 7mm Weatherby die. Is that correct?

Nimrod · Aug 17, 2024

The 7mm Mashburn Super Magnum was a popular wildcat back in the day, and a good one. The late Warren Page was a big fan of Art Mashburn's creation.

Guhndawg · Aug 17, 2024

red6x6 said:
Check out 7mm Practical

http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

Link doesn't work for me?

SemperFi · Aug 17, 2024

red6x6 said:
Check out 7mm Practical

http://www.ballisticstudies.com/Resources/Articles/The+7mm+Practical.++A+Practical+Magnum..html

It says PAGE NOT FOUND. But I think i remember that article.

VinceMule · Aug 17, 2024

The double radius on the weatherby, STOPS doughnuts in their tracks, most miss this.

Jarrett re invented the 7 Mashburn and the 7 Practical. With high quality 300 Win mag brass available now, both of these cases are a tremendous improvement over the std 7/300 Win mag which will have brass flow into the neck.

The 7 Mashburn is what the 7 Rem Mag should have been where the 162s at 3200 gives forever case life and 3350 is top end.

Lenny Foffa · Aug 17, 2024

I do remember way back in the 70,s they guys who were attempting to build 1000 yard rifles were necking down 300. Weatherby cases to 7mm ! That was the first time I ever heard the term BC !! Apparently in the very early stages of Long Range shooting that was a concept that many thought was an intelligent design ! I think , with the availableity of more precise barrels , it could still be a good idea!! I truly enjoyed reading about the experiments of that time ! Here we are 1/2 a century later ,still tinkering and hitting 10 inch plates 1000 yards away and even 1200 to 1500 yards has become possible ! For me this is still exciting . Reminds me of NASA in the 60,s ! I love this stuff!

6.5x300 WBY · Aug 17, 2024

This is cool stuff for sure. Anything 7mm is great. I love McWhorter's idea of their big 7mm. 7mm LRM. 300prc necked down to 7mm. Still trying not to order one.haha

dogz · Aug 17, 2024

7mm-300 Win Mag "7MM-WESTER"

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