Large rifle / large pistol magnum primers?


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Bullet
December 9, 2006, 02:59 AM
I have a 50 Beowulf that uses large pistol magnum primers. Are these as hard as large rifle primers? There is a question about this on another forum as to why the 50 Beowulf doesn’t use rifle primers to prevent slam fires. The 50 Beowulf is a low pressure round.

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EddieCoyle
December 9, 2006, 04:04 AM
It is my understanding that large pistol magnum primers are hotter, not harder than regular large pistol primers; and that rifle primers are harder. Primer hardness varies somewhat brand-to-brand (try the search function I'm pretty sure this has been discussed here before).

As for preventing slam fires, a large rifle primer in a large pistol primer pocket could have the opposite result - large rifle primers are taller than large pistol primers. They'll stick out of a 50 Beowulf case.

Clark
December 9, 2006, 05:41 AM
This page says that magnum primers have thicker cups and not harder cups:
http://www.jamescalhoon.com/primers_and_pressure.php

You can measure cup thickness.


SAAMI specifications on primers and primer pockets per "Sinclair International's Precision Reloading & Shooting Handbook" 10th edition 1999

......................Depth min max diameter min max
small rifle primer pocket .117 .123 .1730 .1745
small pistol primer pocket .117 .123 .1730 .1745
Large rifle primer pocket .125 .132 .2085 .2100
Large pistol primer pocket .117 .123 .2085 .2100

.......................Height min max Diameter min max
Small rifle primers .115 .125 .1745 .1765
small pistol primers .115 .125 .1745 .1765
large rifle primers .123 .133 .2105 .2130
large pistol primers .115 .125 .2100 .2120"

Bullet
December 9, 2006, 10:17 AM
Does more cup thickness increase the amount of force required for a primer to be fired?

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