Forums
New posts
Search forums
What's new
Articles
Latest reviews
Author list
Classifieds
Log in
Register
What's new
Search
Search
Search titles and first posts only
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Can primers reduce E.S.?
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Message
<blockquote data-quote="BountyHunter" data-source="post: 874798" data-attributes="member: 12"><p>A good example of the differences in primers is almost any cartridge based on the 6mm BR case(Dasher, BRX, BRDX etc). </p><p> </p><p>Loaders have found that the CCI 450 IS THE GO TO primer bar none for low ES, SD and accuracy.</p><p> </p><p>Actual pressure tests have shown that changing primers can result in a 7K PSI change.</p><p> </p><p>German Salazar on the Rifleman Blog is one of the few that has done actual pressure tests with strain gauges on testing primer pressure variances. </p><p> </p><p>Also, primers have different characteristics on cup hardness and power levels that do not make them unilaterally interchangeable with every load.</p><p> </p><p>That is also why Qload and other supposed super programs that claim to tell you everything beforehand are not accurate and reliable It is easy to take the data and reconfigure the program to replicate it, but hard to do up front and be really accurate.</p><p> </p><p>Many of the more knowledgable smiths tailor firing pin hole size to firing pin diameter to avoid high pressure issues with cratering back into the firing pin hole. That is why you will often see bolts with firing pin holes that have been bushed to a smaller size. They also tune the springs and pin for no contact/drag within the bolt body.</p></blockquote><p></p>
[QUOTE="BountyHunter, post: 874798, member: 12"] A good example of the differences in primers is almost any cartridge based on the 6mm BR case(Dasher, BRX, BRDX etc). Loaders have found that the CCI 450 IS THE GO TO primer bar none for low ES, SD and accuracy. Actual pressure tests have shown that changing primers can result in a 7K PSI change. German Salazar on the Rifleman Blog is one of the few that has done actual pressure tests with strain gauges on testing primer pressure variances. Also, primers have different characteristics on cup hardness and power levels that do not make them unilaterally interchangeable with every load. That is also why Qload and other supposed super programs that claim to tell you everything beforehand are not accurate and reliable It is easy to take the data and reconfigure the program to replicate it, but hard to do up front and be really accurate. Many of the more knowledgable smiths tailor firing pin hole size to firing pin diameter to avoid high pressure issues with cratering back into the firing pin hole. That is why you will often see bolts with firing pin holes that have been bushed to a smaller size. They also tune the springs and pin for no contact/drag within the bolt body. [/QUOTE]
Insert quotes…
Verification
Post reply
Forums
Rifles, Reloading, Optics, Equipment
Reloading
Can primers reduce E.S.?
Top