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Anyone own a 7mm 300 Win Mag?

 
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  #372  
Old 08-02-2013, 06:15 PM
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Join Date: Dec 2004
Posts: 154
Re: Anyone own a 7mm 300 Win Mag?

been loading for my 7-300 i had longrifles build,,, anyway. 180 berger 27in barrel, win brass, retumbo 74 gr 2860 fps shiny elector mark, h1000 73 gr 2861 ejector mark, 7828ssc 73.5 3072 10 shot ave, high low spread 14 fps,
shot thru a chrony

retumbo and h100 no velocity, 72 gr retumbo shot .3 in group 150 yards at 2760 fps,, the 7828 load right at .7 in, no other messing around with oal ,,,

any thoughts,,
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  #373  
Old 08-02-2013, 06:23 PM
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Join Date: Feb 2007
Location: Townsend, Montana.
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Re: Anyone own a 7mm 300 Win Mag?

Quote:
Originally Posted by 300stw View Post
any thoughts,,
Get an Oehler or a Magneto Speed.

73 gr of H-1000 and a 180 should be well over 2861 from a 27" tube.

In all honesty, I will say your are shooting on different days under different light and the Chrony is fooling with you.

Have you tested drops out to 1000 to see what velocity is needed to match?

Jeff
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  #374  
Old 08-02-2013, 07:59 PM
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Join Date: Dec 2004
Posts: 154
Re: Anyone own a 7mm 300 Win Mag?

all loads were shot in a 1.5 hour time frame this afternoon, chrony and shooting bench stayed in same exact spots, overcast the whole time, no acces to anothe chronograph,,,, havent shot it for drops yet,,, was disappointed with the retumbo velocity, i shoot alot of 7828ssc in my standard 7mag,,,
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  #375  
Old 08-02-2013, 09:22 PM
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Join Date: Oct 2007
Location: Flat Rock, Michigan, USA
Posts: 120
Re: Anyone own a 7mm 300 Win Mag?

Why is is it that I can look in an older Nosler manual (#4) and not see any improvement with a 7STW as compared to a 7RM? If the STW can't do it, how can the 7-300 do it?
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  #376  
Old 08-03-2013, 07:48 AM
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Join Date: May 2013
Posts: 8
Re: Anyone own a 7mm 300 Win Mag?

Fellas,
Me Thinks Something Strange Be Going On With Powders... Between 300Stw's 27 Inch Pipe And My 30 Incher, There Should Only Be An Approximate Velocity Difference Of 75 To 125 Feet Per Second. Given The Numbers He Reported, That Is Holding True. However, 300, Be Wary Of Your 7828SSC Charge, I Got Shiny Extractors, Stiff Bolt Operation, And Loose Primer Pockets Starting At 76.5 Gr. But I Use 76.0 Grains To Propel The Sierra Gameking 180Gr To 3056Fps In My Model 70 .300 Win Mag For Years. Why It WorkS In The Straight .300, But Shows Over Pressure In The 7/.300, I Don't Know.

As For 7 Rem Vs 7STW, I'm Not Sure, All The Data I've Seen Puts The STW Out Front With Velocity. My Brother-In-Law Has A Tikka 7 Rem Mag, And Can Barely Get 2900Fps WitH A Sierra 160 Gameking. My 7/.300 Pushes A Berger 180 At 3056 And Uses Less Powder Than An STW Or RUM to Do It, Which Should Help Increase Barrel Life - Which Is Why We Are Using This Wildcat.
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  #377  
Old 08-03-2013, 08:30 AM
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Join Date: Oct 2007
Location: Flat Rock, Michigan, USA
Posts: 120
Re: Anyone own a 7mm 300 Win Mag?

But isn't your 7 300 pushing a sleeker bullet down the bore?
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  #378  
Old 08-03-2013, 09:40 AM
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Join Date: Mar 2012
Location: NW Louisana
Posts: 300
Re: Anyone own a 7mm 300 Win Mag?

This is just my 2cent's! There are some calibers out there that suited to the case capacity, some are a hot rod, some are slower(but work)! That being said( an I'll be the first one to say I'm not a genus!) the 7/300 just seems to be one of those wildcat's that just work!! Maybe someone else out there, that has more Knowlege than me can explain it better than me. That being said, like I said, the 7/300 just works. Powder to case ratio, bullet BC, powder technology an many other things that just fall in to place! Guess that's one reason it's called wildcatting! I'm in the middle of a build now(7/300) an looking forward to the end result! Many thanks to everybody on this thread for great input an info!!! Many,Many thanks to Broz for him starting this tread an his help!! That's just my 2cents!!

DT
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