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  #1  
Old 12-27-2008, 02:24 PM
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What wildcats have been done from a .300 Win Mag ?


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Just curious. I know the .264 Win Mag, .300 Win Mag, .338 Win Mag and .458 Win Mag are all basically the same case. I want a .264 and a .458, but thats another story. Right now I'm looking for wildcats from the ,300 Win Mag.

223-300
6mm-300
25-300
270-300
8mm-300 (I have a soft spot for the .323's, but would this be any better than my .325 WSM ?)
35-300
375-300
416-300

All sound like fun to me, but which ones exsist ?
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  #2  
Old 12-27-2008, 03:25 PM
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This case has been around for a long time and just about every one you mentioned has been done. If you look here you can find a few.

http://www.reloadbench.com/cartw.html

Here's an outfit that specializes in wildcats. The first is their chamber Reamer list.

http://www.z-hat.com/ReamerList.htm

http://www.z-hat.com/

You can also look up CH and see what reamers and dies they are listing. That would give you an idea of what folks are chambering for.
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  #3  
Old 12-28-2008, 03:59 AM
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The only commercialised derivative is the 425Express, otherwise the 300WinMag is an orphan. Its been necked up and down extensively, its even been long throated and sold as the 'Apollo' line. Being perverse, I've considered both a 411/300WM (similar to a 411KDF) and a 435/300WM. The 8mm I think was Les Bowman's 'Poor man's magnum' as it could be built using a surplus M98 in 8x57.
Cheers...
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  #4  
Old 12-28-2008, 08:57 AM
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Quote:
Originally Posted by Con View Post
...........otherwise the 300WinMag is an orphan. Con
True that.

Actually, Tang, the .264, .338 and .458 Win's (and the 7mm Rem) are of nearly the same case. 2.500" length, 2.204" to the shoulder. The .308 & .358 Normas are nearly identical as well. The .300 Winnie is longer at 2.620" and longer to the shoulder at 2.196" and shorter necked than any of the others, save the .264 WM.

I've always been intrigued by the idea of a lightweight, mountain rifle type deal in .25-.300 WM.
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  #5  
Old 01-01-2009, 06:42 AM
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I have had 3 - 7mm/300 Win Mag wildcats and really like that cartridge ! same performance as the 7 STW with less powder - simple to form brass and well known

Darrell Holland of Powers Oregon has reamers and data
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  #6  
Old 01-01-2009, 10:33 AM
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Originally Posted by magnumitis View Post
True that.

Actually, Tang, the .264, .338 and .458 Win's (and the 7mm Rem) are of nearly the same case. 2.500" length, 2.204" to the shoulder. The .308 & .358 Normas are nearly identical as well. The .300 Winnie is longer at 2.620" and longer to the shoulder at 2.196" and shorter necked than any of the others, save the .264 WM.

I've always been intrigued by the idea of a lightweight, mountain rifle type deal in .25-.300 WM.

You and me both. I first considered a 6.5-300, but that would basically be a .264 Win Mag. The 25-300 has some zip to it. Guys on reloadersnest show 3900fps out of a 95gr Berger, and loads for a 100gr Ballistic Tip ranging from 3500-3800fps.
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  #7  
Old 01-07-2009, 06:12 PM
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Details needed for the 7mm/300 Winchester

Hey BACKCOUNTRY,
What exactly was your load, velocity, and accuracy for your three 7mm/300 Winchesters? This is a favorite cartridge of Jarrett with better accuracy claims than the 7STWs. Is that true?

My STW experience shows that once the velocity gets faster than 3300 fps, the groups open to 1.5" plus.
So, the faster the velocity, the worse the groups. Any insight on your experience?

Thanks for your help.
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  #8  
Old 01-29-2009, 05:25 PM
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I've always wanted a 9.3 x 64 Brennke. I have a Savage in 300 Win Mag....Hmmmmmm Is there enough neck to do that?
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  #9  
Old 01-29-2009, 06:47 PM
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I doubt you'll get much barrel life out of 223-300 or 6mm-300!

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  #10  
Old 02-02-2009, 09:31 AM
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I'm working on a 270/300 streched out right now. I'm hoping it works aswell as the 22 wildcat I just finished. I'm hoping to get 3800fps with the 110gr v-max. It's nice useing factory dies and cases with minimal forming for the cost per shot ratio.
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  #11  
Old 02-03-2009, 02:50 AM
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Quote:
Originally Posted by Wade krinke View Post
My STW experience shows that once the velocity gets faster than 3300 fps, the groups open to 1.5" plus.
So, the faster the velocity, the worse the groups.
I have not seen this, ever, in my STW.
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  #12  
Old 02-23-2009, 12:09 PM
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I thought I posted a reply yesterday but is doesn't appear ??

I have 3, 7mm / 300 win mag rifles - one is simply a Browning A Bolt 7mm rem mag REchambered and it shoots just as good as the other custom barrelled guns - If I TETRA OIL the bore I can "easily" attain 3350 with 150 grain bullets and if I moly the bullets I can get real close to that with 160's -

I don't have the data with me now but Darrell Holland of Powers, OR should have some starting data as well as reamers and dies - He is the one who originally got me onto this wildcat - forming brass is a snap and I think your efficiency is alot better than the STW

On your STW, there are a few things that could be causing groups to grow - can you check for bullet "yaw" on the targets ? are you trying different bullets ? how does the crown look ? it is common for the reverse to happen, it is not easily explained but real - I load 225 Accubonds for a friend's 338 win mag, they will shoot 1 3/4" @ 100 yds and 2" @ 300 yds (and I trust this guy's shooting)
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  #13  
Old 02-26-2009, 04:59 PM
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Tang:

I have been shooting a 375-300WM for about ten years now.

It is a great round, and will easily match the balistics of the 375H&H. The advantage to the wildcating of the 300 WM with larger bullet diameters than .300 is that you get a longer neck to properly grip the bullet. ( Given that you keep the shoulder at the same location )

My rifle is built on a Browning BLR that was originally in 300WM. In rebarreling it I maintained all the same chamber dimensions, changing only the bore and the neck diameter. This gives me a neck length of .320 instead of the .264 found on the 300WM.

I had RCBS make up a set of dies from some fireformed cases that I carefully reloaded then shot without resizing. They also made me a die to use for cutting the neck to length as the cases grow with multiple reloading. I fire form cases in the rifle using esentially squib loads behind oatmeal and a light wadding.

I have also sized cases by shooting a standard 300WM round down the barrel. This is how I got the origional cases to reload to fire for sending the cases to RCBS to use to make the dies.

If anyone would like the case dimensions, email me with your email address and I will forward you a drawing.

Frank

Last edited by fkrutzke; 02-26-2009 at 05:06 PM.
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  #14  
Old 02-27-2009, 05:43 AM
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Welcome to the forum, and thanks for that information!
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  #15  
Old 04-04-2009, 12:14 PM
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I built and shoot a .405-300win mag. Re-barreled a Savage 110 that was originally in 7mm mag. Took the barrel nut away and now it looks nice. I use H4895 powder behind a 300gr Barnes X bullet and have pushed it all the way up to 2850fps. Bolt opened with a slight resistance. Backed off down to around 2700fps.
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  #16  
Old 08-02-2010, 08:34 AM
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Quote:
Originally Posted by Tang View Post
You and me both. I first considered a 6.5-300, but that would basically be a .264 Win Mag. The 25-300 has some zip to it. Guys on reloadersnest show 3900fps out of a 95gr Berger, and loads for a 100gr Ballistic Tip ranging from 3500-3800fps.
The 25-06 AI will get you 3920 fps with a 87 grainer and a lot less powder.
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  #17  
Old 08-02-2010, 09:50 AM
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The 25-06 AI will get you 3920 fps with a 87 grainer and a lot less powder.
Really? How?
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  #18  
Old 08-04-2010, 06:47 AM
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po ackley volume 1
25-06 AI 87 grain bullet
65.0 grains imr 4831 3920 fps
ammoguide.com
25-06 improved 87 grain bullet
imr 4831 65.0 grains 3920 fps
http://ammoguide.com/cgi-bin/ai.cgi?...CGpL&catid=326

Last edited by OKIE; 08-04-2010 at 06:51 AM.
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  #19  
Old 08-04-2010, 07:33 AM
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  #20  
Old 08-15-2010, 01:14 PM
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Well I like that .264/30-06 of mine so much since I started shooting it last year, I have decided that the next wildcat will be a .264/300 Win mag, now for you "metric fans" out there, that is a 6.5/300 Win mag.
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