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Rifles, Reloading, Optics, Equipment
Reloading
7 mm SAW
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<blockquote data-quote="tim_w" data-source="post: 1455999" data-attributes="member: 11132"><p>What is so special about the 30TC shoulder at 30 degrees than any other 30 degree shoulder? Is there some slight compound angle or something that is not easily the seen by eye.</p><p></p><p></p><p>It would be much easier to speak about if we at had a print or some dimensional specs. </p><p></p><p>Without it........Powder space is powder space. To get vel higher he has to be running higher pressure for a given powder vol all things being equal. Now sure using a tougher case head i.e. Lapua 308 palma and then decreasing taper and increase shoulder angle will allow for higher pressure without loss of brass compared to say using a large primer pocket 308 case. There is nothing wrong with it and its a solid design but there is no free lunch. Its basically 7-08 AI but if there is no blowing forward of the shoulder so its using the same shoulder body junction and then sharpening the shoulder to 30 degrees he is actually loosing vol there which is may recover and go positive removing taper.</p><p></p><p>IMO what as done was to turn the 7-08 into as improved case as possible for PRS type shooting. By that I mean a longer neck and increased shoulder angle but so much as to neg effect chambering from a dmag. Decrease taper and increase shoulder allows for more pressure and reloading along with using the Lapua SP Palma 308 brass. My guess is the throat is set specifically for they 162-168gr ELD. Thus they get max case powder vol usage with the BT jnc into the neck and enough length to allow feeding from the AI mags (no plate). </p><p></p><p>Just a wild guess but based on the</p></blockquote><p></p>
[QUOTE="tim_w, post: 1455999, member: 11132"] What is so special about the 30TC shoulder at 30 degrees than any other 30 degree shoulder? Is there some slight compound angle or something that is not easily the seen by eye. It would be much easier to speak about if we at had a print or some dimensional specs. Without it........Powder space is powder space. To get vel higher he has to be running higher pressure for a given powder vol all things being equal. Now sure using a tougher case head i.e. Lapua 308 palma and then decreasing taper and increase shoulder angle will allow for higher pressure without loss of brass compared to say using a large primer pocket 308 case. There is nothing wrong with it and its a solid design but there is no free lunch. Its basically 7-08 AI but if there is no blowing forward of the shoulder so its using the same shoulder body junction and then sharpening the shoulder to 30 degrees he is actually loosing vol there which is may recover and go positive removing taper. IMO what as done was to turn the 7-08 into as improved case as possible for PRS type shooting. By that I mean a longer neck and increased shoulder angle but so much as to neg effect chambering from a dmag. Decrease taper and increase shoulder allows for more pressure and reloading along with using the Lapua SP Palma 308 brass. My guess is the throat is set specifically for they 162-168gr ELD. Thus they get max case powder vol usage with the BT jnc into the neck and enough length to allow feeding from the AI mags (no plate). Just a wild guess but based on the [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7 mm SAW
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