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7mm-300wm Login/Join 


031022



Picture of Leupold Man
posted
Has anyone had experience with this round? If so how hard is it to neck down, velocities, and load data?


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Veteran and NRA Life Member
 
Posts: 2671 | Location: Waterloo Wisconsin | Registered: October 22, 2014Reply With QuoteReport This Post


LIFE



Picture of tgp
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you should be able to neck up 270 WSM brass in a 300WSM F.L. bushing die with the appropriate bushing and a tapered neck expander. Use a 7mm WSM seater die for bullet seating. I would think using maybe a couple of bushings ( may not need but the one) using 300WSM brass shouldn't be a problem either. There couldn't be that big a difference between the 7WSM and the 7mm-300WSM so start with the starting loads for the 7WSM and work up. Good luck and good shooting! Big Grin

Glenn


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“Evil, unchecked, is the prelude to genocide. - Anonymous”
― Joel C. Rosenberg, The Auschwitz Escape


 
Posts: 3505 | Location: mississippi delta | Registered: June 30, 2008Reply With QuoteReport This Post



Picture of Grendel99
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I don't have any experience with it but I thought this was a cool article. He lists reamer specs and velocities (though from a rifle).

http://www.ballisticstudies.co...e/7mm+Practical.html

This is based on the 300 Win Mag, not the WSM.
 
Posts: 960 | Location: Charleston, SC | Registered: June 19, 2010Reply With QuoteReport This Post



121722



Picture of HotRodAl
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quote:
you should be able to neck up 270 WSM brass in a 300WSM F.L.


From his header he wants to neck the 300 Win Mag down to 7mm. The 300WM is 2.620" where as the 7mmRM is 2.500" so you will gain a bit more case capacity not a lot but some so it will gain a few fps velocity over the 7mmRM round.

The neck down of the 300WM should be very easy to do, I think I have a set of 7mmRM dies if I do I'll try to see if its as easy as I think it will be. Give me a few days to check it out and I'll let you know.


Albert
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Life Member NRA
Navy Submarine Veteran
 
Posts: 10643 | Location: Kenova, WV, USA | Registered: October 31, 2003Reply With QuoteReport This Post



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If I'm not mistaken, Sawcarver here on SP is shooting the 7mm-300 WM. (Not WSM)
Maybe he will chime in here?

-Mike
 
Posts: 2291 | Location: Oregon | Registered: December 16, 2009Reply With QuoteReport This Post


LIFE



Picture of tgp
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nuts I'm sorry, I misread his post. Yes, Sawcaver has a 7mm-300WM.

Glenn


------------------------------
“Evil, unchecked, is the prelude to genocide. - Anonymous”
― Joel C. Rosenberg, The Auschwitz Escape


 
Posts: 3505 | Location: mississippi delta | Registered: June 30, 2008Reply With QuoteReport This Post



121722



Picture of HotRodAl
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I sized down 2 cases this evening and they sized like a dream, I kept running the die down until it just kissed the shoulder and using Hornady spray lube.


Albert
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Life Member NRA
Navy Submarine Veteran
 
Posts: 10643 | Location: Kenova, WV, USA | Registered: October 31, 2003Reply With QuoteReport This Post


031022



Picture of Leupold Man
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Thanks for all the great info. I'm going to try this round. Thanks for trying the neck down Al!


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Veteran and NRA Life Member
 
Posts: 2671 | Location: Waterloo Wisconsin | Registered: October 22, 2014Reply With QuoteReport This Post



Picture of Downtown
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Adam does shoot one. According to him it is a beast.
In a good way. Lol


Steve






Open your heart, Do everything for the glory of God
 
Posts: 4179 | Location: Michigan..... Michigan Pistol Hunters on Facebook  | Registered: December 23, 2005Reply With QuoteReport This Post



Picture of Sawcarver
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Yes I have a 7-300 Win Mag. Currently I am shooting 195 bergers out of it just a fuzz over 2700 fps out of a 17.5" barrel. When I have it set up as a bench gun it is about 17lbs and recoil isn't bad at all with a Ross brake on it. It does have a bit of blast factor to it for those standing or sitting beside it and it is loud but its fun. Shots over a mile are do able with it for sure

Adam
 
Posts: 961 | Location: Howell MI | Registered: December 11, 2010Reply With QuoteReport This Post
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