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Anyone own a 7mm 300 Win Mag?

 
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  #330  
Old 07-07-2013, 06:03 PM
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Join Date: Feb 2012
Location: eastern,wa
Posts: 442
Re: Anyone own a 7mm 300 Win Mag?

thanks, i cant wait to shoot this thing.


what are you guys getting for numbers on the ai version?
i would be interested in a print if i could get it, love ackley
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  #331  
Old 07-11-2013, 08:19 PM
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Join Date: Jul 2010
Location: South FL
Posts: 76
Re: Anyone own a 7mm 300 Win Mag?

Here’s the final version of my 7mm wildcat off the 300 Winchester Magnum case. Chamber reamer goes into production today at Pacific Gauge and Tool in Oregon.

I christened it the Valkyrie, a buxom Nordic blonde goddess who is the “chooser of the slain.” It’s also a reference to the XB-70 Valkyrie, an experimental Mach 3 strategic bomber from the ‘60s.

QuickLOAD estimated ballistics (28” barrel; 66k psi max pressure; conservative):
Generic 100 gr Varmint Bullet @ 4175 fps
Generic 110 gr Varmint Bullet @ 4075 fps
Generic 120 gr Medium Game Bullet @ 3975 fps
Generic 140 gr Large Game Bullet @ 3775 fps
Generic 150 gr Large Game Bullet @ 3650 fps
Hornady 162 gr A-Max @ 3500 fps
Berger 168 gr VLD @ 3400 fps
Berger 180 gr VLD @ 3200 fps (what my chamber’s throat was designed for)

7mm Valkyrie (center) alongside comparable cartridges. Parent 300 Win Mag on the right. I drew this up in UG:


Chamber reamer print (not to scale):


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  #332  
Old 07-11-2013, 08:55 PM
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Join Date: Feb 2007
Location: Townsend, Montana.
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Re: Anyone own a 7mm 300 Win Mag?

Chuckhammer, are you going to make your own dies? If so you may want to order a size reamer as well. Just tossing this out there as getting custom dies made is almost impossible right now, or at least it you don't have the reamers.

With the 7mm-300 win I just use standard redding bushing dies for a 300 win and change the bushing.

Jeff
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  #333  
Old 07-11-2013, 09:07 PM
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Re: Anyone own a 7mm 300 Win Mag?

If you give Whidden the reamer print they can make custom dies that will size just right and you dont have to have a sizing reamer. I believe they are around 2 months out.
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"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE Custom

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/

My guess on W3P .308 230 Grain Bullet: G1 .740-.755
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  #334  
Old 07-11-2013, 09:32 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by barnesuser28 View Post
If you give Whidden the reamer print they can make custom dies that will size just right and you dont have to have a sizing reamer. I believe they are around 2 months out.
They still need a sizing reamer don't they? How can they make an undersized die with out one? Maybe I will learn something here.

Jeff
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  #335  
Old 07-11-2013, 10:05 PM
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Join Date: Jul 2010
Location: South FL
Posts: 76
Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by Broz View Post
Chuckhammer, are you going to make your own dies? If so you may want to order a size reamer as well. Just tossing this out there as getting custom dies made is almost impossible right now, or at least it you don't have the reamers.

With the 7mm-300 win I just use standard redding bushing dies for a 300 win and change the bushing.

Jeff
Yep, custom dies are in the cards. According to Kiff the sharp shoulder should nearly eliminate growth. At the pressures I plan to run I figure the primer pockets might open up before it needs FL or body resizing. For neck sizing I was planning to use Redding Type S bushing dies with the sleeve hogged out by my chamber reamer. Ditto the sleeve in a Redding Comp seater die.
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  #336  
Old 07-11-2013, 10:12 PM
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Join Date: Mar 2012
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by Broz View Post
They still need a sizing reamer don't they? How can they make an undersized die with out one? Maybe I will learn something here.

Jeff
I dont think they do, elkaholic sent them a reamer print and they made me a custom seating and sizing die for my Dad's 30/375 S.I. I believe they may have a special tool from Switzerland to single point cut the dies, it looks like this:

Nate Dagley has one and can program his lathe to cut a custom chamber with it.

In use:



__________________

I'm 16
"Firearms are second only to the Constitution in importance; they are the peoples' liberty's teeth."
~George Washington

"The only advantage a light rifle has is weight, all other advantages go to the heavy rifle."
~ JE Custom

Biggest fail of 2014 so far... http://www.longrangehunting.com/foru...ea-ftf-128972/

My guess on W3P .308 230 Grain Bullet: G1 .740-.755
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