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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Pros/Cons of 30 vs 40 degree shoulder?
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<blockquote data-quote="HuntnPack" data-source="post: 2583169" data-attributes="member: 42721"><p><strong>30* vs 40*</strong></p><p><strong></strong></p><p><strong>In regards to just shoulder angle difference only, no other physical case difference.</strong></p><p>For me the advantage goes</p><p>to the standard case angle, be it 30* or 40*.</p><p></p><p>If you have to fire form the case to achieve the shoulder angle then I view that as a slight disadvantage.</p><p></p><p>In my experience the claimed case length growth is not a huge difference</p><p>between these two case angles. & not</p><p>worth the effort to alter for that alone.</p><p></p><p>Also in my experience the process to achieve improved fully fire formed sharpened 40* shoulder angles comes at a cost of</p><p>1-2 brass prep, loading, shooting sessions. As well as some increased</p><p>Cost in non standard reamers, dies etc.</p><p></p><p>As far as 30* vs 40*angle only & the effects on burn characteristics, throat erosion, or accuracy benefits, I believe there are too many variables that may have effects outside of just the slight shoulder angle difference & I'm personally not sure there are measurable differences between the two angles to provide benefits to justify changing from 30* to 40*.</p><p></p><p>Others may view things differently or find benefit in the effort to improve a cartridge case shoulder angle.</p><p></p><p>Having ran several Improved cartridges & design of my own, it has been an enjoyable learning experience, but the small gains if any were minimal in regards to actual field use and ultimately not worth the effort. </p><p></p><p>Going forward I've determined my cartridge selection will be of standard 30*, 35*, 40*</p><p>Shoulder angle offerings not requiring "improvement" or custom dies.</p><p></p><p>My time at the bench is better served focused on</p><p>Gains to be made with quality reloading equipment. Improved powders, & bullets, & use in quality barrels with correct twist rates & improved barrel materials. </p><p></p><p>YMMV.</p></blockquote><p></p>
[QUOTE="HuntnPack, post: 2583169, member: 42721"] [B]30* vs 40* In regards to just shoulder angle difference only, no other physical case difference.[/B] For me the advantage goes to the standard case angle, be it 30* or 40*. If you have to fire form the case to achieve the shoulder angle then I view that as a slight disadvantage. In my experience the claimed case length growth is not a huge difference between these two case angles. & not worth the effort to alter for that alone. Also in my experience the process to achieve improved fully fire formed sharpened 40* shoulder angles comes at a cost of 1-2 brass prep, loading, shooting sessions. As well as some increased Cost in non standard reamers, dies etc. As far as 30* vs 40*angle only & the effects on burn characteristics, throat erosion, or accuracy benefits, I believe there are too many variables that may have effects outside of just the slight shoulder angle difference & I'm personally not sure there are measurable differences between the two angles to provide benefits to justify changing from 30* to 40*. Others may view things differently or find benefit in the effort to improve a cartridge case shoulder angle. Having ran several Improved cartridges & design of my own, it has been an enjoyable learning experience, but the small gains if any were minimal in regards to actual field use and ultimately not worth the effort. Going forward I've determined my cartridge selection will be of standard 30*, 35*, 40* Shoulder angle offerings not requiring “improvement” or custom dies. My time at the bench is better served focused on Gains to be made with quality reloading equipment. Improved powders, & bullets, & use in quality barrels with correct twist rates & improved barrel materials. YMMV. [/QUOTE]
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Pros/Cons of 30 vs 40 degree shoulder?
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