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Extreme Long Range Hunting & Shooting (ELR)
"High" pressure vs "Standard" pressure
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<blockquote data-quote="J E Custom" data-source="post: 1312044" data-attributes="member: 2736"><p>I can only give you my take on this because of my experiences with over pressure loads.</p><p></p><p>First SAMMI sets the pressure normally based on the age of the round and the materials used. (A good example would be the 45/70. IT was designed for black powder and so were the original rifles</p><p>so when you buy Ammo for it, It is the lower pressure loading for use in the still available trap dore rifles because of its design. </p><p></p><p>Lots of modern rifle cartridges were designed for pressures less than 60,000 psi. the most recent cartridge designs have bump it up to 65,000 PSI. That is near the design capabilities of the modern rifle designs plus a 50% safety factor. also the cartridge cases are also near there maximum capabilities.</p><p></p><p>If you exceed this pressure you may get away with it but the actions will suffer and have a shorter usable life, your brass will most likely not have very good life and is more prone to failure early on.</p><p>one of the more common problems with overloads, the actions begin to increase the head space from bolt set back and at some point has to be re set.</p><p></p><p>Once I owned and shot matches with an "Overloaded cartridge and brass life was two firings at best and sometimes once. once "I" figured out that all I had to do was go to a cartridge with more case capacity, the problem went away and equipment and components lasted much longer and with little or no ware on the action. Plus an increase in velocity.</p><p></p><p>All of My wildcats are designed around a pressure of 63,000 psi and velocity is not a problem amd greatly exceeds other cartridges in the same bullet diameter and weight. all it takes is more case capacity and a few inches of longer barrel to burn the powder.</p><p></p><p>When loading "High Pressure loads" everything becomes critical and mistakes or deviation from the norm can sneak up on you and cause problems.</p><p></p><p>The simple solution is rather THAN load above SAMMI pressures use a bigger cartridge that can hold more slower burning powder and can exceed velocities without all the potential problems. so don't expect a .223 to be competitive in performance with 22/250. </p><p></p><p>Just my opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1312044, member: 2736"] I can only give you my take on this because of my experiences with over pressure loads. First SAMMI sets the pressure normally based on the age of the round and the materials used. (A good example would be the 45/70. IT was designed for black powder and so were the original rifles so when you buy Ammo for it, It is the lower pressure loading for use in the still available trap dore rifles because of its design. Lots of modern rifle cartridges were designed for pressures less than 60,000 psi. the most recent cartridge designs have bump it up to 65,000 PSI. That is near the design capabilities of the modern rifle designs plus a 50% safety factor. also the cartridge cases are also near there maximum capabilities. If you exceed this pressure you may get away with it but the actions will suffer and have a shorter usable life, your brass will most likely not have very good life and is more prone to failure early on. one of the more common problems with overloads, the actions begin to increase the head space from bolt set back and at some point has to be re set. Once I owned and shot matches with an "Overloaded cartridge and brass life was two firings at best and sometimes once. once "I" figured out that all I had to do was go to a cartridge with more case capacity, the problem went away and equipment and components lasted much longer and with little or no ware on the action. Plus an increase in velocity. All of My wildcats are designed around a pressure of 63,000 psi and velocity is not a problem amd greatly exceeds other cartridges in the same bullet diameter and weight. all it takes is more case capacity and a few inches of longer barrel to burn the powder. When loading "High Pressure loads" everything becomes critical and mistakes or deviation from the norm can sneak up on you and cause problems. The simple solution is rather THAN load above SAMMI pressures use a bigger cartridge that can hold more slower burning powder and can exceed velocities without all the potential problems. so don't expect a .223 to be competitive in performance with 22/250. Just my opinion J E CUSTOM [/QUOTE]
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"High" pressure vs "Standard" pressure
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