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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone with 300 RUM plus p
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<blockquote data-quote="TwoMore" data-source="post: 1404825" data-attributes="member: 95166"><p>It is a stepped land. the reamer is set up to remove half of the land's height for a determined length.so a .004 tall land will be .002 for that determined length,, easier to start the engraving process. less initial pressure , when the second lead is hit the total land is engraved. I have been playing with 4 different chamberings with this,338 wm, 7-300 wm ,7mm Ultra rogue, 7mm RSAUM the saum is not built yet. It is my understanding that this style of throating has been around for years.</p><p></p><p>I am not being a smarta$$ by any means but be careful . My findings with my Ultra Rogue has been it will loosen a primer pocket before usual signs of pressure. and I am sure you know with Retumbo it only takes 1 grain of powder more to go explosive and blow the back of a shell into the bolt face sides. I usually dont look for ejector marks or stiff bolt. I measure case head and web and primer pockets and primer flow into the pin hole, usually if I see an ejector mark on a rp case the pocket has opened up some.</p><p>ps I shoot the vortex optics but the razor HD's <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> and they work great</p></blockquote><p></p>
[QUOTE="TwoMore, post: 1404825, member: 95166"] It is a stepped land. the reamer is set up to remove half of the land's height for a determined length.so a .004 tall land will be .002 for that determined length,, easier to start the engraving process. less initial pressure , when the second lead is hit the total land is engraved. I have been playing with 4 different chamberings with this,338 wm, 7-300 wm ,7mm Ultra rogue, 7mm RSAUM the saum is not built yet. It is my understanding that this style of throating has been around for years. I am not being a smarta$$ by any means but be careful . My findings with my Ultra Rogue has been it will loosen a primer pocket before usual signs of pressure. and I am sure you know with Retumbo it only takes 1 grain of powder more to go explosive and blow the back of a shell into the bolt face sides. I usually dont look for ejector marks or stiff bolt. I measure case head and web and primer pockets and primer flow into the pin hole, usually if I see an ejector mark on a rp case the pocket has opened up some. ps I shoot the vortex optics but the razor HD's :) and they work great [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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