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7mm ultra mag
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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mikael
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Joined: May 31, 2005
Posts: 2

PostPosted: Tue May 31, 2005 7:05 am    Post subject: 7mm ultra mag Reply with quote

i have a custom 7mm stw is there anny ide tho do a 7mm ultra mag. if hove much velocity can i expect from lothar walther 28" barrel 10" tvist
mikael.
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DallanC
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Joined: Jan 18, 2005
Posts: 3496
Location: Utah

PostPosted: Tue May 31, 2005 10:26 am    Post subject: Re: 7mm ultra mag Reply with quote

Hello Mikael, what country are you from?

I own a 7STW and love it. If I were buying a new rifle today however I would probably still go with the 7STW. I've heard that with similar barrels, you only gain around 40-50 fps over a STW when using a ultra. BUT the ultra burns more powder to do it and they also have faster barrel wear.


-DallanC
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mikael
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PostPosted: Tue May 31, 2005 10:51 am    Post subject: Re: 7mm ultra mag Reply with quote

im from sweden, what did you use four powder and bullet combination in your stw. and which velocity do you geth. the powder i have is mrp and mrp2
mikael
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DallanC
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Joined: Jan 18, 2005
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Location: Utah

PostPosted: Tue May 31, 2005 1:03 pm    Post subject: Re: 7mm ultra mag Reply with quote

I am currently starting over looking for a new 140grn load using RL22 powder as the basis.

Previously I had been trying to get Barnes 140gr XLC's to shoot with a darn using everything from H4831 to H1000, 7828 to RL25. My best load was 88grns H1000 (warning, this is a XLC load only! it is 8grns over a non-coated bullets max... but still .5 grns under Barnes max) giving 3490fps. Accuracy was around 1.25" which was ok for hunting elk but I want better accuracy (factory rem ammo shoots .75") so I'm starting over.

I havent been able to get out and shoot yet due to some flooding in the house and all the reloading equipt being packed up while we got new sheetrock and carpet installed. Getting things moved back in to the rooms as we speak actually. I spent most of yesterday re-oiling my rifles as I put them back in the gunsafe.

I'll post more later once I'm able to do some field work and get some on paper and crony results.


-DallanC
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