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Anyone own a 7mm 300 Win Mag?

 
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  #344  
Old 07-12-2013, 02:19 PM
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Join Date: Jul 2010
Location: South FL
Posts: 76
Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by calib View Post
well another learning phase working with this rifle. i have 21 rounds through the barrel which mean little to nothing, because i got a wrong reading of oal length using just a sized down 300 win mag gauge for the hornady set up. my first 9 shots where jammed about 100 thousands, came home with a zeroed gun at least, did some measuring and talked to bill about what is going on, brass was fine, but bullets were going in too far, so i put a bullet in a fired case and shoved it in being all marked up with sharpie i could see where it was pushing it to, so i measured that and got 100 thousands less so i went 103 thousands shorter, took those out and fired them off and still had some issues, came home talked to bill about the gauge and then got a hold of brad and asked him to machine out one of my fired cases to make a clean gauge for me, got that done found out over all i was about 150 thousands jammed with the first 9. now i have a baseline to work from, but even with a sized piece of brass once fired i get resistance closing the bolt, so now we are thinking head space/ shoulder bump which i have never bumped any cases so this is all new. i also sent an e mail to where the reamer came from to try to get a diagram for measurements of my chamber. hope to get this all figured out with in the next few weeks and out shooting again. this gun doesn't kick any more than a 243 liking it so far.

in my pressure test which i am sure numbers are not worth much i went from 73-77 grains with no real pressure problems with velocities ranging from 3050-3222fps, with all 9 shots within 3" at 200 yards.
Refresh my memory, is this a straight 7mm-300WM shooting 180 Bergers? Bbl length? Are you single-loading them or feeding from the mag? If the latter, the bullets could be slipping forward under recoil while still in the mag.
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  #345  
Old 07-12-2013, 02:29 PM
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Join Date: Feb 2012
Location: eastern,wa
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Re: Anyone own a 7mm 300 Win Mag?

Single load, 29" barrel, straight 7-300win 180 berg vld
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  #346  
Old 07-12-2013, 04:07 PM
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Join Date: Jul 2010
Location: South FL
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Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by calib View Post
Single load, 29" barrel, straight 7-300win 180 berg vld
H1000, correct?

I'm looking forward to seeing what RL-33 can do in mine. Double-base so it's very high energy and also just about the perfect burn speed for compressed loads under a 180 in these cases. Likely going to bit a little temperature sensitive but we don't swing more than ~30F around here during the day, year round (65-95 deg). Gotta love South FL.

Of course, there are no large mammals for me to blast around here.......
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  #347  
Old 07-12-2013, 04:08 PM
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Re: Anyone own a 7mm 300 Win Mag?

Just to let you know.
I am having much better results in my 7-300ai with Norma cases and retumbo.
For me.. retumbo out performed h1000 by a large margin.
Win cases have worked well also.
The Norma cases have the largest capacity followed by the win.
I wasted a lot of time with rws cases, while they are definitely quality cases..I found the capacity too small. I had pressure problems with much less velocity then the other cases..with much reduced loads.
That is with 162 and 180gr bullets
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  #348  
Old 07-12-2013, 05:02 PM
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Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by RockZ View Post
Just to let you know.
I am having much better results in my 7-300ai with Norma cases and retumbo.
For me.. retumbo out performed h1000 by a large margin.
Win cases have worked well also.
The Norma cases have the largest capacity followed by the win.
I wasted a lot of time with rws cases, while they are definitely quality cases..I found the capacity too small. I had pressure problems with much less velocity then the other cases..with much reduced loads.
That is with 162 and 180gr bullets
Good info. I've got some Win brass necked down to 284 and figured it was the best combo of strength and capacity. Had heard Norma brass was dimensionally very consistent but a bit soft. I guess you'd found it to be nearly as strong as Win brass?
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  #349  
Old 07-12-2013, 08:22 PM
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Re: Anyone own a 7mm 300 Win Mag?

Yes
My Norma brass is extremely consistent,has high powder capacity and has been as durable as win brass.
With 162 amax while fire forming brass with 83gr retumbo at 3.586"oal I'm getting 3500fps out of a 29" barrel with no bolt lift issues and very little case head expansion and no hard extractor marks.
The bolt cycles smooth and easy.
With rws brass and h1000 I was getting terrible pressure signs at 3050fps.
Not what I expected, but that is the way it played out.
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  #350  
Old 07-12-2013, 08:45 PM
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Location: Townsend, Montana.
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Re: Anyone own a 7mm 300 Win Mag?

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Originally Posted by RockZ View Post
Yes
With rws brass and h1000 I was getting terrible pressure signs at 3050fps.
Not what I expected, but that is the way it played out.
I have posted many times that with RWS brass in a 300 win case to need to back off 3 to 4 grains. It is due to the much lower case volume of the RWS. So did you try the loads with 180's and H-1000 in the Norma brass? I have always wanted to try the load in Norma or Lapua brass that has larger case capacity.

Jeff
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