Having admittedly already hijacked the thread, "In a Pinch", I wish to apply logic to the issue titled above.
Consider that no primer manufacturer will ever suggest that it is acceptable to exceed the pressure limits as set by ASCII. Furthermore, standard primer cups are considered capable of attaining those pressure limits without the threat of structural failure. In other words, most loads use standard primers to attain maximum pressures without failure.
Also, consider that manufacturers recommend magnum primers only for the purpose of igniting difficult to ignite powders...not to exceed the pressure limits for that cartridge. From what I have garnered over the years is that the manufacturer uses a priming mixture that provides a hotter, longer flame duration (http://www.cci-ammunition.com/products/primers/primers.aspx?id=29 ).
Therefore, the logic does not support why a manufacturer would need to use a thicker cup for magnum primers.
Nevertheless, my logic could be faulty...actual measurements would be a better assessment. Although I have measured Federal Small Pistol Standard Primers and found that my admittedly primitive dial calibers indicate that both have a cup thickness of .016 of an inch, I will not generalize my result to all primer brands, and types (Small Rifle, Large Rifle, etc.).
Consider that no primer manufacturer will ever suggest that it is acceptable to exceed the pressure limits as set by ASCII. Furthermore, standard primer cups are considered capable of attaining those pressure limits without the threat of structural failure. In other words, most loads use standard primers to attain maximum pressures without failure.
Also, consider that manufacturers recommend magnum primers only for the purpose of igniting difficult to ignite powders...not to exceed the pressure limits for that cartridge. From what I have garnered over the years is that the manufacturer uses a priming mixture that provides a hotter, longer flame duration (http://www.cci-ammunition.com/products/primers/primers.aspx?id=29 ).
Therefore, the logic does not support why a manufacturer would need to use a thicker cup for magnum primers.
Nevertheless, my logic could be faulty...actual measurements would be a better assessment. Although I have measured Federal Small Pistol Standard Primers and found that my admittedly primitive dial calibers indicate that both have a cup thickness of .016 of an inch, I will not generalize my result to all primer brands, and types (Small Rifle, Large Rifle, etc.).