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7mm Practical

 
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  #1  
Old 07-09-2011, 11:37 AM
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7mm Practical

Hey guys, I've stumbled across some info on this wildcat and was wondering if anyone has any real world experience with it? Its a 300 win mad necked to 7mm with a 30 degree shoulder. Looks very intriguing to me. I've been in the mindset to build another 7mm.
Anyone heard of it? Good-bad? From what I've read looks perfect for 168s-180s and not as 'boring' (dare I say) as the 7mm RM.
Thanks guys!
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Old 07-09-2011, 12:09 PM
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Re: 7mm Practical

The 7mm STW is a standard cartridges and better cartridge. It outperforms the 7mm-300 win mag so what is the point. I have shot both the 7mm-300 wby and the 7mm-8mm rem mag since the 70's along with the 7mm wby and remington and a bunch others. I know these pretty well. When the necked 8mm rem mag case was called an STW in the late 90's and I could get cheap factory brass for it I went with it over the 7mm-300 wby. You can get about the same peformance as the 7mm-300 win mag out of the 7mm Weatherby and the factory 7mm STW is better than both so why go to all the trouble with the 7mm-300 win mag. The short Dakota gives great performance on a standard magnum action with the ability to seat the bullets out more than you will be able to with the 300 winchester necked. When Devin gets his 7mm SIN out there with more powder than the 7mm STW on that short dakota case it will be a good one.

I had to edit because I was in a hurry and had one cartridge on my mind and typing another. I am trying to understand the purpose of the 7mm-300 win mag when so many duplicate it or are just slower or faster and factory rounds.
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Last edited by Long Time Long Ranger; 07-09-2011 at 03:51 PM.
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  #3  
Old 07-09-2011, 08:03 PM
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Re: 7mm Practical

I was going to go that route myself, but ended up with the 7LRM...7mm-375 Ruger. I am getting an honest 3170fps with the Berger 180VLD using 73.9grs of H1000 and a Fed. 215m. Here are some pics of the rifle and targets. Sorry no 73.9 targets yet, but they are coming soon. Based on what the 7mm STW uses for powder, I don't see it as a winner. All targets shot at 200yds and the 73.3 loads going 3155fps.
Attached Thumbnails - Click to View Larger
7mm Practical-gun-2.jpg   7mm Practical-gun-5.jpg  

7mm Practical-gun-6.jpg   7mm Practical-mms_picture.jpg  

7mm Practical-gun-3.jpg  

Last edited by moombaskier; 07-09-2011 at 08:12 PM. Reason: left out velocities
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Old 07-10-2011, 09:39 AM
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Re: 7mm Practical

How about the 284 JAZZ (improved 300 or 338 norma cases necked down). How does this wildcat compare with the dakota round? Haven't heard much of this round lately.
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Old 07-10-2011, 10:32 AM
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Re: 7mm Practical

Well I have heard a lot of good things on the 7 dakota. I'm just wanting something that will shoot the heavys. I have a 7 SAUM that's a tack driver with 130 matchkings and I'm just wanting something that will be fun to shoot and not burn out barrels. I loaded for a buddies 7 RUM that shot extremely well but was toast at 700 rounds. I like to shoot, and I'm horrible at not 'babying' rifles.
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Old 07-10-2011, 12:35 PM
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Re: 7mm Practical

I have tested 7mm's quite a bit since the 70's and the 7mm STW is about where the line is drawn for performance vs. any kind of barrel life. Back in late 98 when I first started necking the soon to be released 300 RUM case I did two 7mm's that gave great performance but barrel life was short. I went back and settled on the STW as the top 7mm. I have six of those now and it is a fun cartridge to shoot. Any more in a 7mm and barrel life starts to suffer pretty bad. Some of the new cases mentioned on here like the Ruger I have not worked with since they came along after I retired and quit building rifles.

The 7mm-300 winchester has been done since the 300 winchester first came out. It never gained much popularity because it splits a small gap in performance between the 7mm remington/7mm Weatherby and the 7mm-300 wby and 7mm stw. If a guy wants a repeater with the long heavy bullets he does the remington or the weatherby. If he wants top performance he does the stw or necked 300 wby. The 7mm-300 winchester gives you the worst of both worlds. Less room to seat long bullets out with very little velocity gain over the remington or 7mm wby. It does not have the velocity/power of the STW or 7mm-300 wby. So it sits between there not allowing long bullets seated out and not getting the top velocity. That is why it never took off.
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Last edited by Long Time Long Ranger; 07-10-2011 at 12:38 PM.
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Old 07-10-2011, 12:47 PM
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Re: 7mm Practical

That's why I love this site, guys more knowledgeable than I am. I understand now. Thank you a bunch. I guess I will go back to the drawing board. As of now I have two Rem 700s in 7 RM. Both I got pretty cheap because the barrels are in rough shape. One is set aside for my Edge build. The other I'm wanting to build another 7mm or 6.5mm. Again thank you guys a lot.
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