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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm rifle build
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<blockquote data-quote="tim_w" data-source="post: 1454570" data-attributes="member: 11132"><p><em>Guess a SWAG but......Grab some 6.5x284 norma lapua case run it thru a 7mm mandrel load and you are at 280 AI vel. Set the chamber to a 40 degree shoulder and .010 case taper and you have a simple AI fireform using a jammed bullet ideally. Now you have exceeded vel of 280AI and have equal powder capacity. </em></p><p><em></em></p><p><em>Even SAAMI shows the sharp AI shoulder and less tapered cases are good to almost 70K max mean pressure 65K max variable psi 69.1K. With lapua cases no issue at all from my experience with numerous loadings.</em></p><p><em></em></p><p><em>If it were me I would set throat for the 175-180 eld and bergers as you have lots of room with the short fatter 284 case even in a medium action. 24-26" barrel</em></p><p><em></em></p><p><em>Lapua cases easy forming or not... whats not to like.... I do like the longer case neck of the 280 better but not a deal breaker. </em></p><p><em></em></p><p><em>Unless factory loaded ammo is a must have that would be my choice. Tech you could shoot 284 win ammo in that chamber. </em></p><p><em></em></p><p><em></em></p></blockquote><p></p>
[QUOTE="tim_w, post: 1454570, member: 11132"] [I]Guess a SWAG but......Grab some 6.5x284 norma lapua case run it thru a 7mm mandrel load and you are at 280 AI vel. Set the chamber to a 40 degree shoulder and .010 case taper and you have a simple AI fireform using a jammed bullet ideally. Now you have exceeded vel of 280AI and have equal powder capacity. Even SAAMI shows the sharp AI shoulder and less tapered cases are good to almost 70K max mean pressure 65K max variable psi 69.1K. With lapua cases no issue at all from my experience with numerous loadings. If it were me I would set throat for the 175-180 eld and bergers as you have lots of room with the short fatter 284 case even in a medium action. 24-26" barrel Lapua cases easy forming or not... whats not to like.... I do like the longer case neck of the 280 better but not a deal breaker. Unless factory loaded ammo is a must have that would be my choice. Tech you could shoot 284 win ammo in that chamber. [/I] [/QUOTE]
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7mm rifle build
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