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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 PRC 156 load development
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<blockquote data-quote="vancewalker007" data-source="post: 2173635" data-attributes="member: 66917"><p>That's ok you can disagree. This stuff is all anecdotal anyway and the difference in performance will vary rifle to rifle and cartridge to cartridge. All I can tell you is I did notice a difference in 3 300 WSMs I loaded for a few years ago and I wasn't looking for it, it just showed up. Two of rifles were SAAMI spec'd chambers the third was a custom chamber set up to shoot long .30 cal bullets. Now of course the barrels were not from the same company and the actions were all different. The barrels were all 24 inches, not that matters as I was looking more at pressure signs. I was using the same components in all 3 rifles.</p><p></p><p>The SAAMI rifles were a Sako A7 and a Winchester M70. The custom barrel was on a Kimber Montana action. When shooting say a Berger 190 VLD the SAAMI rifles had to be seated much deeper than the custom rifle to fit in the mags and shoot good. In the custom the 190s would end up with the bullet base near the neck/shoulder junction, the SAAMI chambers required the bullet to be around a .25in into the powder column. When shooting powder ladders I noticed I could always get almost an extra grain of powder into the custom chamber before pressuring out. I didn't completely understand the phenomenon until the read this article on Berger's site.</p><p></p><p>[URL unfurl="true"]https://bergerbullets.com/effects-of-cartridge-over-all-length-coal-and-cartridge-base-to-ogive-cbto-part-1/[/URL]</p><p></p><p>So, when I built my PRC I wanted to take as much advantage of the case space as possible and to do that I needed a longer action to put the bullet base where I wanted. I wish I would have had the 156 EOL when I had it built but it wasn't. I guess I could have used a 700 Long action and achieved the same effect. I don't have a SAAMI 6.5 PRC to compare to with the same loads so I cannot say how much difference there would be with this cartridge.</p></blockquote><p></p>
[QUOTE="vancewalker007, post: 2173635, member: 66917"] That's ok you can disagree. This stuff is all anecdotal anyway and the difference in performance will vary rifle to rifle and cartridge to cartridge. All I can tell you is I did notice a difference in 3 300 WSMs I loaded for a few years ago and I wasn't looking for it, it just showed up. Two of rifles were SAAMI spec'd chambers the third was a custom chamber set up to shoot long .30 cal bullets. Now of course the barrels were not from the same company and the actions were all different. The barrels were all 24 inches, not that matters as I was looking more at pressure signs. I was using the same components in all 3 rifles. The SAAMI rifles were a Sako A7 and a Winchester M70. The custom barrel was on a Kimber Montana action. When shooting say a Berger 190 VLD the SAAMI rifles had to be seated much deeper than the custom rifle to fit in the mags and shoot good. In the custom the 190s would end up with the bullet base near the neck/shoulder junction, the SAAMI chambers required the bullet to be around a .25in into the powder column. When shooting powder ladders I noticed I could always get almost an extra grain of powder into the custom chamber before pressuring out. I didn't completely understand the phenomenon until the read this article on Berger's site. [URL unfurl="true"]https://bergerbullets.com/effects-of-cartridge-over-all-length-coal-and-cartridge-base-to-ogive-cbto-part-1/[/URL] So, when I built my PRC I wanted to take as much advantage of the case space as possible and to do that I needed a longer action to put the bullet base where I wanted. I wish I would have had the 156 EOL when I had it built but it wasn't. I guess I could have used a 700 Long action and achieved the same effect. I don't have a SAAMI 6.5 PRC to compare to with the same loads so I cannot say how much difference there would be with this cartridge. [/QUOTE]
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6.5 PRC 156 load development
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