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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Berger 245 EOL Best Cartridge
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<blockquote data-quote="elkaholic" data-source="post: 2375996" data-attributes="member: 13833"><p>Here is some added info:</p><p>I designed the 30/375 S.I. several years ago which was basically the 30 SM now.</p><p>Hornady made the dies for it!</p><p>About 3 years ago, Hornady came out with the 300 prc. If it wasnt for my slightly smaller neck diameter, I could have chambered their round and fired it. Head space was nearly identical! Of course they kept their normal 30 degree shoulder, but they straightened the case wall closer to a Sherman from the 375 case.</p><p>At that time, I changed my neck diameter to take advantage of the factory brass. While I was at it, I took out a little more taper, and added some FB for the newer high b c bullets.</p><p>That said, the 300 prc is no WM and will outrun it easily and the SM will outrun the PRC easily. Part of this is due to capacity and part is due to case design; And PART of the case design is it will allow more pressure to be run without destroying brass (grips the sidewall better and lessens bolt thrust) IMO, the 40 degree shoulder helps facilitate more powder burning inside the case and cuts down on case stretching as well.</p></blockquote><p></p>
[QUOTE="elkaholic, post: 2375996, member: 13833"] Here is some added info: I designed the 30/375 S.I. several years ago which was basically the 30 SM now. Hornady made the dies for it! About 3 years ago, Hornady came out with the 300 prc. If it wasnt for my slightly smaller neck diameter, I could have chambered their round and fired it. Head space was nearly identical! Of course they kept their normal 30 degree shoulder, but they straightened the case wall closer to a Sherman from the 375 case. At that time, I changed my neck diameter to take advantage of the factory brass. While I was at it, I took out a little more taper, and added some FB for the newer high b c bullets. That said, the 300 prc is no WM and will outrun it easily and the SM will outrun the PRC easily. Part of this is due to capacity and part is due to case design; And PART of the case design is it will allow more pressure to be run without destroying brass (grips the sidewall better and lessens bolt thrust) IMO, the 40 degree shoulder helps facilitate more powder burning inside the case and cuts down on case stretching as well. [/QUOTE]
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Berger 245 EOL Best Cartridge
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