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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New build 264 Win Mag vs 6.5/257 Weatherby
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<blockquote data-quote="Mike D Texas" data-source="post: 2261837" data-attributes="member: 71221"><p>257 Wby is super easy to convert to 6.5mm. I use an expander mandrel to neck up to .262" (.002" under bullet diameter) and that's literally it.</p><p></p><p>The points you make about the 264 is the main reason it's still being considered.</p><p>One thing also that appears to be a advantage with the Wby case design is I believe it can be pushed harder than the 264WM. I'm pushing my 257 Wby well beyond published max loads with (so far) no loss of accuracy or damage to the brass. I'm currently pushing a 115 Berger at 3600+ and only seeing very faint ejector marks but no other signs of pressure. I suspect that's due to the large amount of free bore on Weatherby chambers. Which brings up another uncertainty and that is if I decided to go with the Weatherby case, what freebies would I have built into the reamer? The 257 Wby shows to have .375" of free bore.</p></blockquote><p></p>
[QUOTE="Mike D Texas, post: 2261837, member: 71221"] 257 Wby is super easy to convert to 6.5mm. I use an expander mandrel to neck up to .262” (.002” under bullet diameter) and that’s literally it. The points you make about the 264 is the main reason it’s still being considered. One thing also that appears to be a advantage with the Wby case design is I believe it can be pushed harder than the 264WM. I’m pushing my 257 Wby well beyond published max loads with (so far) no loss of accuracy or damage to the brass. I’m currently pushing a 115 Berger at 3600+ and only seeing very faint ejector marks but no other signs of pressure. I suspect that’s due to the large amount of free bore on Weatherby chambers. Which brings up another uncertainty and that is if I decided to go with the Weatherby case, what freebies would I have built into the reamer? The 257 Wby shows to have .375” of free bore. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
New build 264 Win Mag vs 6.5/257 Weatherby
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