Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

Anyone own a 7mm 300 Win Mag?

 
LinkBack Thread Tools Display Modes
  #498  
Old 02-06-2014, 03:29 PM
Silver Member
 
Join Date: Oct 2009
Location: USA
Posts: 280
Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by joeycoates View Post
Well, this is the caliber that I am going to use after reading the whole thread and developing a slight headache in the process... I was going to chamber in 7stw, but I think that the 7-300 has a lot to offer, it will allow me to use my existing DBM with a 3.715" magazine for a 300WM, and brass should be easier to find.
I'm in a similar position as well - I'm sitting on ~350 (same lot) new WW .300 Win cases (and have another ~100 which have 2x or 3x firings) from when I last reloaded (it's been way too long.......). The 7mm-300 WinMag seems like such an easy upgrade from the 7mm Rem Mag - especially for those who hand-load.

Though hand-loading for the 7mm Rem Mag to it's more realistic potential (which is radically different from the anemic hand-loading manual suggestions) vastly improves from what's available over-the-counter.


Quote:
Originally Posted by joeycoates View Post
But holy cow there seem to be more variations than you can shake a stick at! I have been reloading for several years, but this will be my first go around with a wildcat cartridge. I would think that to keep it simple, and since I can find dies for a 7-300, that it would be easier just to go with the "normal" 7-300? I know that many have had good results with the improved shoulders, but to do that you would be looking at custom dies correct?
True, True, TRUE!!!!

Quote:
Originally Posted by joeycoates View Post
........ and I have annealed several of my existing cases with a simple drill and torch setup so that is taken care of, but I have never used a bushing die setup. I understand how it works, just never used one. I guess that I could buy a bushing die and do it like Broz has done, stepping down bushings to get the neck diameter to where it needs to be, I just do not know if this is necissary.
I used to use the RCBS Precision Mic bullet seating die (on advice from my hand-loading teacher/mentor) which is a bushing die. Though I suppose this different than the forming die you're mentioning..... oops


Quote:
Originally Posted by Nimrod View Post
The 7mm Mashburn Super Magnum uses a standard die set from RCBS and Redding may list it as well but I'm not sure. PTG has the reamer print. There are a lot of variations on the .300 WM case but from what I have seen the ballistics are all similar. I went with the Mashburn mostly due to nostalgia but it is a very good round any way you slice it IMO.

Bob
Bob - please excuse my ignorance..... but, how does the 7mm Mashburn Super Magnum compare to the 7mm-300 WinMag?

Pragmatically, does it have greater ballistics than the 7mm-300 WinMag?
Does it have more of shoulder angle/lack of body taper?

Anyway, thanks in (hopeful!) advance

frank
Reply With Quote
  #499  
Old 02-06-2014, 05:52 PM
Silver Member
 
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Anyone own a 7mm 300 Win Mag?

Hi guys, sorry to interupt, just wanted to let folk know that I have revised the 7mm Practical article on our site to make it more user friendly (hopefully).

New article is here:
http://www.ballisticstudies.com/Know...Practical.html

Last edited by Kiwi Nate; 02-06-2014 at 06:51 PM.
Reply With Quote
  #500  
Old 02-06-2014, 06:21 PM
Silver Member
 
Join Date: Oct 2009
Location: USA
Posts: 280
Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by Kiwi Nate View Post
Hi guys, sorry to interupt, just wanted to let folk know that I have revised the 7mm Practical article on our site to make it more user friendly (hopefully).

New article is here:
http://www.ballisticstudies.com/Knowledgebase/7mm+Practical.html
Broken linky......
Reply With Quote
  #501  
Old 02-06-2014, 06:53 PM
Silver Member
 
Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Anyone own a 7mm 300 Win Mag?

Thanks fmajor, my bad, I did not use the LRH forum hyperlink properly.

7mm Practical
Reply With Quote
  #502  
Old 02-06-2014, 10:18 PM
Silver Member
 
Join Date: Aug 2006
Location: Missouri Ozarks
Posts: 418
Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by fmajor View Post

Bob - please excuse my ignorance..... but, how does the 7mm Mashburn Super Magnum compare to the 7mm-300 WinMag?

Pragmatically, does it have greater ballistics than the 7mm-300 WinMag?
Does it have more of shoulder angle/lack of body taper?

Anyway, thanks in (hopeful!) advance

frank
Frank,

The Mashburn tapers to .494 at the body/shoulder junction and has a 30 degree shoulder. This is another neck down in the FL sizer and shoot wildcat boasting speeds of over 3000 fps with the 175 grain Partition from a 24" barrel. Dave Kiff already has the print for this one it's #15106.

With new WW Super brass, trimmed to 2.600" and sized in the Mashburn FL die H20 capacity is 84 grains, with the same case fireformed in the Mashburn chamber is 90 grains H20. The trim length on the Mashburn is actually 2.625 but my brass didn't clean up there. The late Warren Page was reported to have killed in excess of 700 head of game with his 7mm Mashburn (Old Betsy)

I was ready to pull the trigger on Nate's 7mm Practical but I stumbled across an article on the Mashburn and things just fell into place from there.

Bob
Reply With Quote
  #503  
Old 02-17-2014, 10:25 PM
Silver Member
 
Join Date: Apr 2007
Location: Lincoln Co., NV
Posts: 170
Re: Anyone own a 7mm 300 Win Mag?

Tried RL25 in mine today and it went great. I know it can be sensitive to temp whereas H1000 is not. I have a couple pounds of the RL25 and figured why not try it.

Berger 180 gr. vld hunting
71 gr. shot a little over 1/4MOA @200 yds.
72 gr. shot under 1/4MOA @200 yds.
73 gr. shot 1/2MOA @200 yds.

Later in the day I took it out to check velocity. Loaded 72 gr. and shot it @540 yards. Drop shows it is going a little over 3100fps. Seems to be a mild load with no hint on pressure. It held under 1/2MOA and it was a little windy.

This is with cci magnum primers and Norma brass and I am currently using a Forster bump-bushing die. I bump the shoulder back a thousandth and have a couple thousandths of neck tension.

New batch of Brass had the 'donut' in the inside at the neck shoulder junction. A round file worked well removing them.


Impressed with the caliber so far. Took a sheep in 2012 @320 yards, a mule deer this year at a little under 600 yards, and also a cow elk at about 830 yards.
Reply With Quote
  #504  
Old 02-17-2014, 10:27 PM
Silver Member
 
Join Date: Apr 2007
Location: Lincoln Co., NV
Posts: 170
Re: Anyone own a 7mm 300 Win Mag?

Tried RL25 in mine today and it went great. I know it can be sensitive to temp whereas H1000 is not. I have a couple pounds of the RL25 and figured why not try it.

Berger 180 gr. vld hunting
71 gr. shot a little over 1/4MOA @200 yds.
72 gr. shot under 1/4MOA @200 yds.
73 gr. shot 1/2MOA @200 yds.

Later in the day I took it out to check velocity. Loaded 72 gr. and shot it @540 yards. Drop shows it is going a little over 3100fps. Seems to be a mild load with no hint on pressure. It held under 1/2MOA and it was a little windy - temp was 60 degrees

This is with cci magnum primers and Norma brass and I am currently using a Forster bump-bushing die. I bump the shoulder back a thousandth and have a couple thousandths of neck tension.

New batch of Brass had the 'donut' in the inside at the neck shoulder junction. A round file worked well removing them.


Impressed with the caliber so far. Took a sheep in 2012 @320 yards, a mule deer this year at a little under 600 yards, and also a cow elk at about 830 yards.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
Do you plan to buy a new custom rifle in the next 12 months?
YES - Of course - 72.94%
1,650 Vote
NO - wife/girlfriend won't let me. - 27.06%
612 Votes
Total Votes: 2,262
You may not vote on this poll.

All times are GMT -5. The time now is 12:21 AM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC