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Anyone own a 7mm 300 Win Mag?

 
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  #491  
Old 01-12-2014, 11:32 PM
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Join Date: May 2007
Location: Taranaki New Zealand
Posts: 182
Re: Anyone own a 7mm 300 Win Mag?

When PTG create the neck diameter for these 7mm wildcats, the neck is generally tight, but without need of neck turning- for the most part.

A while ago I came across a batch of Nosler .300 Win Mag brass that was too tight, jacking up pressures and limiting accuracy potential. The client was given two options, either stay with Nosler and neck turn or change to Winchester. The clientg opted to change to Winchester. This brought groups down to sub quarter MOA with a gain in velocity of 100fps. So- be weary when it comes to brass brands for the various 7mm-300's.

.284 has offered more useful info regarding the goal of versatility. Good things to keep in mind.
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  #492  
Old 01-13-2014, 07:14 AM
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Join Date: Jan 2014
Posts: 3
Re: Anyone own a 7mm 300 Win Mag?

When I called Dave at PT&G I told him I wanted a 7-300 reamer that would allow me to shoot the 180 berger VLD's and would fit into an AICS magazine. He sent me the "Bison Barrels" reamer with .095 of freebore. Shorter than what most are using here but we'll see how it works. Worst case scenario I'll have a smith dial in a little bit more with a thrifting reamer.
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  #493  
Old 01-13-2014, 09:58 PM
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Join Date: Nov 2013
Location: Great Falls, Montana
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Re: Anyone own a 7mm 300 Win Mag?

Kiwi nate, I sent you a PM. thanks
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  #494  
Old 01-14-2014, 12:11 PM
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Join Date: Oct 2013
Location: Texas
Posts: 99
Re: Anyone own a 7mm 300 Win Mag?

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.

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?

I am going to use a 28" 5c 8.5 twist barrel, either from Brux , Benchmark or maybe Pac-Nor. Probably in a light varmint or maybe a Sendero contour. I do not yet know what smith I am going to use, but if they already have a 7-300 reamer, do I need to buy one from PTG, or is that normally done just so you can have your own specific reamer for an improved version of the 7-300? I would assume if they have a reamer that they can set the throat up to shoot the 180gr Bergers or the 195's if they ever come out?

I guess if I go with Benchmark or Pac-Nor then it looks as if they already have the reamers so maybe I can just have them do all of the gunsmithing to simplify things. This is really a whole different ball game for me so I have so many questions, and I would much rather do it once and do it right.

I have read where some people are stepping down the neck diameters when re-sizing, and it seems that others just run it through the 7-300 dies to get it right. I already have a neck reamer so I can do that, 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.

Thanks for whatever guidance you guys can offer. I guess it will be done one step at a time and then it will get there!
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  #495  
Old 02-05-2014, 06:44 PM
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Join Date: Feb 2013
Posts: 28
Re: Anyone own a 7mm 300 Win Mag?

I have a Sendero II in 7mag. It shoots fine but if I wanted to convert it to a 7-300, is it worth reaming the factory barrel? It only has about 120 rounds down it so far.

Also, Are reamers available to rent or would I have to purchase one?

Thanks!
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  #496  
Old 02-05-2014, 06:52 PM
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Join Date: Feb 2012
Location: eastern,wa
Posts: 438
Re: Anyone own a 7mm 300 Win Mag?

I would say so if you have a smith that will
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  #497  
Old 02-05-2014, 07:08 PM
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Join Date: Aug 2006
Location: Missouri Ozarks
Posts: 418
Re: Anyone own a 7mm 300 Win Mag?

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?
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
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