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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Shocked at how much throat erosion
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<blockquote data-quote="Steve Shelp" data-source="post: 184317" data-attributes="member: 22"><p>Alan,</p><p> I'm one of the guys that posted on the benchrestcentral.com post that Bountyhunter put up a link to. I keep very close track of my rifles on this. Two posters here have already pointed out a very important detail and one of the big disadvantages of using the steel rod and 2 stop method. You need to use the exact same bullet everytime. The tips do vary form lot to lot. But let me state that I don't think this accounts for all of your .130" of erosion taking the bullet variation into account. That is excessive for a 30-06 even an improved version. So did you use the same bullet to measure the throat erosion now as when it was new?</p><p></p><p> I always take a bullet when I get a new style and put it asside in my loading bench organizer. It one of those metal cabinets with several small plastic drawers in it. One drawer is set aside jsut for these "benchmark" bullets and I use them for checking seating depth and checking neck clearance on neck turned brass. That is it. when I'm done with them they go back into this drawer. Keep in mind I shoot several widlcats and use custom bullets for 90% of my shooting time. If your talking about a hunting rifle then maybe I would suggest keeping 1 benchmark bullet in your reloading die case might be a good idea. Especially seeing how you are only using 2 different bullet style in the BTs and ABs.</p><p> As for the method I use to measure this. I use the Stoney Point device on a set of calipers that gives me a OAL reference dimension. And I use the majic marker also to clearly see the engraving to begin with. I seat a bullet in a dummy case and keep adjusting back until the land engravings go away. When I'm close I use 0000 steel wool to polish the bullet and a jewelers loupe to watch the engraving pattern. This is the very simplified version. But you get the jist of it. This method is also a good way to see if the throat is burning out evenly also. Remove your ejector when using this method or simply use a neck sized only casing to help cut down on the off-center issue.</p><p></p><p></p><p>On the issue of certain powders causing more erosion: I use a lot of Allaint Reloader and Hodgdon slow burning powder in several widlcats and haven't seen any evidence yet to support one wears out a barrel more then the other. I think what the one poster saw in his 7mm Mag after switching powders and slowed the erosion down was the thruth. But it probably wasn't caused by switching powders. I would have to say it was the non-linear erosion that was discussed in the post on BRCentral.com. Throats will wear fast in the beginning then slow down after all the nice sharp edges of the chambering reamer burnoff rather easily. This is a repeatable pattern for any caliber.</p><p> I think the best analogy I can think of is when you throw a book into a fire. The edges of the pages catch pretty easy, but then it takes forever for the whole book to burn up. Sometime you can sift through a firepit and find centers of pages that are readable that were totlaly engulfed in flames just hours ago. Same scenario to me.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="Steve Shelp, post: 184317, member: 22"] Alan, I'm one of the guys that posted on the benchrestcentral.com post that Bountyhunter put up a link to. I keep very close track of my rifles on this. Two posters here have already pointed out a very important detail and one of the big disadvantages of using the steel rod and 2 stop method. You need to use the exact same bullet everytime. The tips do vary form lot to lot. But let me state that I don't think this accounts for all of your .130" of erosion taking the bullet variation into account. That is excessive for a 30-06 even an improved version. So did you use the same bullet to measure the throat erosion now as when it was new? I always take a bullet when I get a new style and put it asside in my loading bench organizer. It one of those metal cabinets with several small plastic drawers in it. One drawer is set aside jsut for these "benchmark" bullets and I use them for checking seating depth and checking neck clearance on neck turned brass. That is it. when I'm done with them they go back into this drawer. Keep in mind I shoot several widlcats and use custom bullets for 90% of my shooting time. If your talking about a hunting rifle then maybe I would suggest keeping 1 benchmark bullet in your reloading die case might be a good idea. Especially seeing how you are only using 2 different bullet style in the BTs and ABs. As for the method I use to measure this. I use the Stoney Point device on a set of calipers that gives me a OAL reference dimension. And I use the majic marker also to clearly see the engraving to begin with. I seat a bullet in a dummy case and keep adjusting back until the land engravings go away. When I'm close I use 0000 steel wool to polish the bullet and a jewelers loupe to watch the engraving pattern. This is the very simplified version. But you get the jist of it. This method is also a good way to see if the throat is burning out evenly also. Remove your ejector when using this method or simply use a neck sized only casing to help cut down on the off-center issue. On the issue of certain powders causing more erosion: I use a lot of Allaint Reloader and Hodgdon slow burning powder in several widlcats and haven't seen any evidence yet to support one wears out a barrel more then the other. I think what the one poster saw in his 7mm Mag after switching powders and slowed the erosion down was the thruth. But it probably wasn't caused by switching powders. I would have to say it was the non-linear erosion that was discussed in the post on BRCentral.com. Throats will wear fast in the beginning then slow down after all the nice sharp edges of the chambering reamer burnoff rather easily. This is a repeatable pattern for any caliber. I think the best analogy I can think of is when you throw a book into a fire. The edges of the pages catch pretty easy, but then it takes forever for the whole book to burn up. Sometime you can sift through a firepit and find centers of pages that are readable that were totlaly engulfed in flames just hours ago. Same scenario to me. Steve [/QUOTE]
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Shocked at how much throat erosion
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