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7mm-300 Win Mag

 
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  #1  
Old 02-12-2012, 07:12 PM
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7mm-300 Win Mag

I have researched all about this wildcat and would like some advise or info for selecting a reamer. I see that several guys here have one and would like to know if leaving the shoulder angle at 25 deg is better than improving to 30 like the 7mm Practical. Also would it benefit from taking what case taper is in it out and just make it stright walled. I think this would be a great cartridge since I have already got some 300 winny brass. Any advice on this would be appreciated.
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Old 02-12-2012, 08:24 PM
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Re: 7mm-300 Win Mag

Quote:
Originally Posted by Long Range View Post
I have researched all about this wildcat and would like some advise or info for selecting a reamer. I see that several guys here have one and would like to know if leaving the shoulder angle at 25 deg is better than improving to 30 like the 7mm Practical. Also would it benefit from taking what case taper is in it out and just make it stright walled. I think this would be a great cartridge since I have already got some 300 winny brass. Any advice on this would be appreciated.
Personally I think a 5 degree difference is negligible and you won't know the difference.
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Old 02-12-2012, 10:03 PM
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Re: 7mm-300 Win Mag

If you leave it standard you can use a .300wm bushing die or a .300wm FL dies and a generic Hornady neck die. If you change it then it's all custom for a FL die.
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Old 02-12-2012, 10:08 PM
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Re: 7mm-300 Win Mag

Sounds like it would be better left alone for the availability of dies. What would you recommend for the freebore to be able to shoot the 162 Amax and the 168-180 bergers.
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  #5  
Old 02-12-2012, 11:23 PM
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Re: 7mm-300 Win Mag

Send a sample case with the bullet seated where you want it.
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  #6  
Old 02-13-2012, 05:24 PM
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Re: 7mm-300 Win Mag

Why not do a 7mm STW. Over the counter, cheaper, faster and a better long range cartridge.
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  #7  
Old 02-13-2012, 05:34 PM
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Re: 7mm-300 Win Mag

I have done 3 so far and love them. We have well passed the throat life of some of the larger 7mm's like the RUM and STW. I prefer leaving the 25 degree shoulder. This makes the choice of dies easy. I use Redding comp bushing dies for a 300 win and simply step down necks by reducing bushing size until I am at the needed bushing for 7mm. I also feel there is some inherent accuracy from the 300 win case as we are seeing excellent accuracy from all 3 rifles. So I would leave the taper alone and keep it simple and also for easy extraction. We have done 9 twists and throated for 180 Bergers. The velocity is plenty good from a 28" tube with H-1000 for propellent easily in the 3150 to 3175 area @ 4000 ft.

Hope this helps to answer your origional posted questions.

Jeff
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Last edited by Broz; 02-13-2012 at 07:11 PM.
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