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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7 stw vs 7 ultra mag
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<blockquote data-quote="Trickymissfit" data-source="post: 708300" data-attributes="member: 25383"><p>Tony got less than 400 rounds thru his STW before the barrel went south. His second barrel was a Krieger, and it did last a few rounds longer (maybe 600). Last time I talked with him he was using a Hart made of 17PH4 stainless steel. The only reason I know this is that he came to me with questions on how to machine the steel. Now I have not talked to Tony in a few years, so I can't say for sure he's still using that barrel. The other guys and I were not all that close. One thing on the plus side about the STW was that it seemed to group very well at very long rage consistently (750+ yd.). The Ultra mag neck is too short and the vortex of the flame path is right into the throat. This means barrels suffer greatly. The Weatherby neck is slightly under .40" in length with a 47 degree shoulder angle (data is in the AA manual). This puts the flame pathe in the first two thirds area of the neck. In otherwords a great design. The longer neck also helps to guide big long bullets into the throat better. My guess is that if Tony got 600 rounds out of the Krieger barrel, then he should see at least 1200 or maybe even 1500 rounds out of the Weatherby mag. Now for the disclaimer! If you ream a chamber without free bore (all rounds have some free bore by the way), you'll have to back your loads off to something like a 7mm mag for starters. Then work your way back up. (you may use even less powder to get there by the way). There are other 7mm mags out there that also are very good. I kinda like the Mashburn series (either one). There's also the 7mm Ackley mag.</p><p>gary</p></blockquote><p></p>
[QUOTE="Trickymissfit, post: 708300, member: 25383"] Tony got less than 400 rounds thru his STW before the barrel went south. His second barrel was a Krieger, and it did last a few rounds longer (maybe 600). Last time I talked with him he was using a Hart made of 17PH4 stainless steel. The only reason I know this is that he came to me with questions on how to machine the steel. Now I have not talked to Tony in a few years, so I can't say for sure he's still using that barrel. The other guys and I were not all that close. One thing on the plus side about the STW was that it seemed to group very well at very long rage consistently (750+ yd.). The Ultra mag neck is too short and the vortex of the flame path is right into the throat. This means barrels suffer greatly. The Weatherby neck is slightly under .40" in length with a 47 degree shoulder angle (data is in the AA manual). This puts the flame pathe in the first two thirds area of the neck. In otherwords a great design. The longer neck also helps to guide big long bullets into the throat better. My guess is that if Tony got 600 rounds out of the Krieger barrel, then he should see at least 1200 or maybe even 1500 rounds out of the Weatherby mag. Now for the disclaimer! If you ream a chamber without free bore (all rounds have some free bore by the way), you'll have to back your loads off to something like a 7mm mag for starters. Then work your way back up. (you may use even less powder to get there by the way). There are other 7mm mags out there that also are very good. I kinda like the Mashburn series (either one). There's also the 7mm Ackley mag. gary [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7 stw vs 7 ultra mag
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