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Rifles, Reloading, Optics, Equipment
Reloading
flat/blown primer within recommended specs
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<blockquote data-quote="FearNoWind" data-source="post: 987960" data-attributes="member: 50867"><p>There are more variables in your load than just COAL. The test data in the manual was not recorded with the bullet touching the lands. The absence of any jump in the OAL means the test data in the manual is invalid for your loading purposes. Also consider that the tests rifle(s) were most likely strict SAMMI factory specs. When we build our own rifles we sometimes play with the chambering specs - or so I'm told. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /> A little tighter neck, some shoulder adjustments, ???</p><p>The increased twist rate will also contribute to higher pressures.</p><p>The Berger bullets have greater surface engagement with the rifling than many other bullets so it's difficult to compare the Berger 180 VLD (which is what I use in my .284) with other bullets of the same caliber.</p><p>As an added note, the Chrono won't tell you anything except muzzle velocity and the factors generally associated with MV (ES/SD/etc.) so while it may help you decide how efficient your loads are it can't do much else for you.</p><p>I'd suggest you back down the load, run the Chrono tests as you build the load and find the efficient node for your rifle. Then stop.</p><p>Pushing the bullet faster isn't necessarily a good thing, and the 7STW is notorious for short lived barrels. Great cartridge and deadly accurate, but a chamber throat eater-upper.</p></blockquote><p></p>
[QUOTE="FearNoWind, post: 987960, member: 50867"] There are more variables in your load than just COAL. The test data in the manual was not recorded with the bullet touching the lands. The absence of any jump in the OAL means the test data in the manual is invalid for your loading purposes. Also consider that the tests rifle(s) were most likely strict SAMMI factory specs. When we build our own rifles we sometimes play with the chambering specs - or so I'm told. :D A little tighter neck, some shoulder adjustments, ??? The increased twist rate will also contribute to higher pressures. The Berger bullets have greater surface engagement with the rifling than many other bullets so it's difficult to compare the Berger 180 VLD (which is what I use in my .284) with other bullets of the same caliber. As an added note, the Chrono won't tell you anything except muzzle velocity and the factors generally associated with MV (ES/SD/etc.) so while it may help you decide how efficient your loads are it can't do much else for you. I'd suggest you back down the load, run the Chrono tests as you build the load and find the efficient node for your rifle. Then stop. Pushing the bullet faster isn't necessarily a good thing, and the 7STW is notorious for short lived barrels. Great cartridge and deadly accurate, but a chamber throat eater-upper. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
flat/blown primer within recommended specs
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