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Anyone own a 7mm 300 Win Mag?

 
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  #519  
Old 04-04-2014, 10:43 AM
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Join Date: Oct 2013
Location: Texas
Posts: 99
Re: Anyone own a 7mm 300 Win Mag?

Thanks for the responses guys. Both barrels are 5R rifled so I am not going to run into any issues with bullets coming apart, or I certainly would not expect any issues. We are waiting on both the chamber reamer and the die reamer from PTG right now, so I have a little while to decide. As far as cut rifled to button rifled barrels are concerned, well, I guess that I am not concerned.. I think that either of the barrels will be more than capable of shooting. The barrel, action and bolt are going to be salt bath nitrided after an initial break in which I would imagine should help throat life as well.

My only concern would be the added weight, it is not going to be a pack rifle, but all of those ounces do start to add up. However, heavier with a brake would help with recoil though, and the extra length may give me a wee bit more velocity. I don't think that I can make a bad choice with either. I do know that with either I will have to find a pretty good size case to hold the rifle, a Pelican 1750 is not going to be long enough from my initial measurements. Do you guys know of any good cases that are pretty long? If I go with the Broughton I will be looking at a 29" barrel with a 2-2.5" brake on it. That will make for a pretty long rifle overall.
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  #520  
Old 04-18-2014, 10:41 AM
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Re: Anyone own a 7mm 300 Win Mag?

I am shooting a Remington Sendero 7RM right now. I am wondering are you guys able to get a 7/300win mag round in the magazine of a remington with a 180 berger hybrid seated out close to the lands without having to put a new mag box on it? I can get a 7RM round in there with it seated out long. Seems like in the 300 case it would get to be too long without using a new mag box.
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  #521  
Old 04-18-2014, 11:05 AM
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Join Date: Oct 2008
Location: Boise, ID
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Re: Anyone own a 7mm 300 Win Mag?

You'd have to seat 180's a bit deeper than normal to make it run through a factory mag box. My reamer is a .188 throat and with 162 Amax's it is perfect at 3.605 AOL.
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  #522  
Old 04-18-2014, 12:01 PM
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Join Date: Jul 2012
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by IdahoCTD View Post
You'd have to seat 180's a bit deeper than normal to make it run through a factory mag box. My reamer is a .188 throat and with 162 Amax's it is perfect at 3.605 AOL.
Kinda what I figured. Thanks
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  #523  
Old 05-30-2014, 01:04 AM
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Join Date: Apr 2008
Location: Honolulu,HI
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Re: Anyone own a 7mm 300 Win Mag?

Need some advice with my 7-300.

New build ,Remi action,broughton 5c 1-8 twist.7-300 312 nk.

Been having some pressure problems during initial fireforming.
Sarting load was 168smk 68-70 gr of H1000 with RWS brass.
The builder told me it ts 312 neck chamber.
Tried turning necks for more clerance and din't change much.flat primers and cratering. bullets seated at 3.400. accuracy seem to be pretty good considering.
Second time around went with Norma brass same load and same results.
Turned the necks on the norma brass as well.
Loaded round neck dia. was .308
With reduce load at 66gr of H1000,still was getting primer cratering, but no flattening of the primer.
Bit discouraged at this point.
Also not my first rodeo with wildcats.done a number of them,but this one is kicking by ass.
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  #524  
Old 05-30-2014, 10:04 AM
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Join Date: Aug 2009
Posts: 145
Re: Anyone own a 7mm 300 Win Mag?

I'm not sure how far your jump to the lands is but are you able to seat the bullets a little deeper in the case. That may help reduce the initial pressure spike.

Another thing to check for is to measure your belts on the case. If they are a little short or if the reamer had cut the recess for the belt a little long the firing pin may be pushing the whole case forward before it fires and expands into the chamber.
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  #525  
Old 05-30-2014, 10:18 AM
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Join Date: Oct 2008
Location: Boise, ID
Posts: 795
Re: Anyone own a 7mm 300 Win Mag?

It may just be a sloppy firing pin hole. Remington's are notorious for that. It allows the primer to flow back around the firing pin. If there aren't any ejector marks on the cases or the cases aren't growing ahead of the belt I would bet that is the issue.

I shoot 73grs of H-1000 with 162 Amax's in RWS cases so your loads seem really light. What is your velocity like? My 27" barrel is going 3190fps and my 28" barrel is doing 3230fps and both shoot under 3/8".
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