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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
NEW 7 SHERMAN SHORT TACTICAL (SST)
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<blockquote data-quote="archangel485" data-source="post: 2088352" data-attributes="member: 97905"><p>[USER=112192]@SteelBanger[/USER] based on your post I believe I may need some education. How would either over sizing the brass, or seating the bullets too deep allow the brass to move forward when the firing pin strikes? When I think about what holds the brass against the bolt face, would it not be the extractor? The extractor holds the rim of the brass and would keep the brass from moving forward when fired, regardless of the headspace or the bullet seating depth, correct? That said, I am skeptical that either your over sized brass or your bullet seating depth have anything to do with your light primer strikes. The first two places I would look if I were having light primer strikes are my trigger and my primer seating. Looks like you have a TT trigger and those are generally rock solid but it would still be worth investigating to ensure everything is working properly with it. How did you seat the primers? Are you certain they are all the way bottomed out? And what brand are they? I have some rem primers for example that you can physically see the anvil protruding above the base of the cup, by probably 10-15 thousandths, I have to seat those very well to make sure that anvil gets pushed up into the cup. </p><p></p><p>On another note, you can be 100% sure of your exact seating depth from the lands. Check this video out, he describes the Hornady OAL tool, but then describes a much better method starting around 2:46, so I'd fast forward and start at that point. [MEDIA=youtube]Zglr3m5v-nI[/MEDIA] </p><p></p><p>I used this exact method on my 7SST just a few days ago. Once I got to where the bolt would close, I seated the bullet 1 thousandth deeper at a time until that "pop" on the bolt lift was gone completely, and called that my at lands depth, then I took a CBTO measurement and recorded that for future reference. I am going to start with my bullets 10 thousandths behind the lands. I would not recommend being right at the lands but I know some guys do.</p></blockquote><p></p>
[QUOTE="archangel485, post: 2088352, member: 97905"] [USER=112192]@SteelBanger[/USER] based on your post I believe I may need some education. How would either over sizing the brass, or seating the bullets too deep allow the brass to move forward when the firing pin strikes? When I think about what holds the brass against the bolt face, would it not be the extractor? The extractor holds the rim of the brass and would keep the brass from moving forward when fired, regardless of the headspace or the bullet seating depth, correct? That said, I am skeptical that either your over sized brass or your bullet seating depth have anything to do with your light primer strikes. The first two places I would look if I were having light primer strikes are my trigger and my primer seating. Looks like you have a TT trigger and those are generally rock solid but it would still be worth investigating to ensure everything is working properly with it. How did you seat the primers? Are you certain they are all the way bottomed out? And what brand are they? I have some rem primers for example that you can physically see the anvil protruding above the base of the cup, by probably 10-15 thousandths, I have to seat those very well to make sure that anvil gets pushed up into the cup. On another note, you can be 100% sure of your exact seating depth from the lands. Check this video out, he describes the Hornady OAL tool, but then describes a much better method starting around 2:46, so I'd fast forward and start at that point. [MEDIA=youtube]Zglr3m5v-nI[/MEDIA] I used this exact method on my 7SST just a few days ago. Once I got to where the bolt would close, I seated the bullet 1 thousandth deeper at a time until that "pop" on the bolt lift was gone completely, and called that my at lands depth, then I took a CBTO measurement and recorded that for future reference. I am going to start with my bullets 10 thousandths behind the lands. I would not recommend being right at the lands but I know some guys do. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
NEW 7 SHERMAN SHORT TACTICAL (SST)
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