Specialty Pistols
7mm-300wm

This topic can be found at:
https://specialtypistols.infopop.cc/eve/forums/a/tpc/f/6251040391/m/3420047586

January 22, 2017, 06:49 PM
Leupold Man
7mm-300wm
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
January 22, 2017, 08:08 PM
tgp
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


January 22, 2017, 09:32 PM
Grendel99
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.
January 22, 2017, 09:41 PM
HotRodAl
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
January 22, 2017, 09:42 PM
40xmike
If I'm not mistaken, Sawcarver here on SP is shooting the 7mm-300 WM. (Not WSM)
Maybe he will chime in here?

-Mike
January 23, 2017, 08:20 AM
tgp
nuts I'm sorry, I misread his post. Yes, Sawcaver has a 7mm-300WM.

Glenn


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


January 23, 2017, 06:04 PM
HotRodAl
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
January 23, 2017, 07:50 PM
Leupold Man
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
January 24, 2017, 01:20 PM
Downtown
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
January 26, 2017, 04:05 PM
Sawcarver
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