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Rifles, Reloading, Optics, Equipment
Reloading
Primers-fps
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<blockquote data-quote="J E Custom" data-source="post: 1219934" data-attributes="member: 2736"><p>All Primers have a different Brisance. (Heat) and cause different powders to react differently.</p><p></p><p>One of the first rules of re loading it that you never change/substitute components without reducing the powder charge first.</p><p></p><p>Several things can/will happen when you substitute primers, Pressure can go up or down. SDs and ESs will/can change and in most cases velocity will change.</p><p></p><p>Primers are a very important part of the ignition process and should be carefully selected.</p><p></p><p>In a test I did using a 7 STW I switched from Rem 9 1/2 mag primers to fed 215 primers. the velocity went up nearly 60 ft/sec but the SDs also went from a very good .09 to a poor .27 (3 time worse) this could have been different results with different powders that react differently.</p><p></p><p>Allways use the primer listed in the manual if it is available. if you have to substitute, use the Brisance chart to adjust the powder charge to a safe level.</p><p></p><p> <a href="http://www.castingstuff.com/primer_testing_reference.htm" target="_blank">Primer Testing Reference</a></p><p></p><p>You will see a large difference if you go from a large rifle primer to a magnum primer so look at primer Brisance.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1219934, member: 2736"] All Primers have a different Brisance. (Heat) and cause different powders to react differently. One of the first rules of re loading it that you never change/substitute components without reducing the powder charge first. Several things can/will happen when you substitute primers, Pressure can go up or down. SDs and ESs will/can change and in most cases velocity will change. Primers are a very important part of the ignition process and should be carefully selected. In a test I did using a 7 STW I switched from Rem 9 1/2 mag primers to fed 215 primers. the velocity went up nearly 60 ft/sec but the SDs also went from a very good .09 to a poor .27 (3 time worse) this could have been different results with different powders that react differently. Allways use the primer listed in the manual if it is available. if you have to substitute, use the Brisance chart to adjust the powder charge to a safe level. [url=http://www.castingstuff.com/primer_testing_reference.htm]Primer Testing Reference[/url] You will see a large difference if you go from a large rifle primer to a magnum primer so look at primer Brisance. J E CUSTOM [/QUOTE]
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