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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Neck Clearance
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<blockquote data-quote="MAX" data-source="post: 24049" data-attributes="member: 184"><p>Other than McPherson's hemispherical shoulder(SMC2 is the case name or company name), his position was that the 45* shoulder was the next most efficient shape for ignition efficiency. I don't recall what support he put forth in the article for that. As I recall it had to do with the shoulder angle focusing the primer shock pattern at a point below the bullet base.</p><p></p><p>He has patented the hemispherical shape BTW, and it may be just as well for he reports difficulty in forming cases.</p></blockquote><p></p>
[QUOTE="MAX, post: 24049, member: 184"] Other than McPherson's hemispherical shoulder(SMC2 is the case name or company name), his position was that the 45* shoulder was the next most efficient shape for ignition efficiency. I don't recall what support he put forth in the article for that. As I recall it had to do with the shoulder angle focusing the primer shock pattern at a point below the bullet base. He has patented the hemispherical shape BTW, and it may be just as well for he reports difficulty in forming cases. [/QUOTE]
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