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Anyone own a 7mm 300 Win Mag?

 
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  #351  
Old 07-12-2013, 09:12 PM
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Re: Anyone own a 7mm 300 Win Mag?

Broz,
I read all of your past posts and worked up from low powder charges and ran many simulations on quick load with the rws brass capacity and all I could get was 3050fps. I start with loads in the 50kpsi pressure range. I wasn't surprised at pressure at low charges I was surprised by the low max velocity with that specific combination. I simply just got much less velocity than with win and Norma brass.
I tried h1000 with win brass but not Norma. It worked out ok but not as good as retumbo.
I went with retumbo because I could take best advantage of the case capacity and still keep pressures lower with good velocity. Plus on quick load z1 and pmax lined up well as far as I can remember.
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  #352  
Old 07-12-2013, 09:16 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by RockZ View Post
I went with retumbo because I could take best advantage of the case capaacity
Ok Thanks, but doesn't it take more Retumbo than H-1000? I was looking for a little more case capacity and that's why I didn't like the RWS.

Jeff
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  #353  
Old 07-12-2013, 09:33 PM
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Re: Anyone own a 7mm 300 Win Mag?

Broz,
No , it doesn't take more retumbo on a volume basis but it allows a larger more sufficient charge of retumbo (that smaller capacity cases won't allow). This enables us to take advantage of and get the best results considering volume fill percentage,burn rate and pressure curve characteristics.
With h1000 you hit pressure way before case volume limitations ,but you can fit quite a bit more h1000in the case than retumbo.
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  #354  
Old 07-12-2013, 09:35 PM
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Re: Anyone own a 7mm 300 Win Mag?

Broz ,
I read your question again. If you are asking am I using a higher powder charge with retumbo than h1000.
The answer is yes.
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  #355  
Old 07-12-2013, 09:44 PM
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Join Date: Jul 2010
Location: South FL
Posts: 68
Re: Anyone own a 7mm 300 Win Mag?

Anyone tried Reloader 33 in this or similar cartridges? Likely more temperature sensitive that the Hodgdon "extreme" powders like H1000 and Retumbo but appears to yield a bit more zip for the same pressure. Going off of QL, that is.
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  #356  
Old 07-12-2013, 10:09 PM
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by RockZ View Post
Broz ,
I read your question again. If you are asking am I using a higher powder charge with retumbo than h1000.
The answer is yes.
Yeah, that's what I was saying. or trying to
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  #357  
Old 07-26-2013, 10:12 AM
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Join Date: Dec 2001
Location: Central Washington.
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Re: Anyone own a 7mm 300 Win Mag?

What size bushing are you guys using for the winchester unturned .300 Win mag brass for sizing. I have a 7mm-300 Variant called a 7.21 Sage it is almost identical to the Valkeri print in this thread with the acceptation of a 35 degree shoulder. I had mine done last year, reamer that is. I'm just getting a barrel chambered now.
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