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Rifles, Reloading, Optics, Equipment
Reloading
Making 257 wby brass from 7mm wby brass
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<blockquote data-quote="Dean2" data-source="post: 2727906" data-attributes="member: 26077"><p>I have formed 7 Rem Mag brass, you should have the Weatherby Radius shoulder after sizing. It doesn't need to be fire formed. Look at the picture of the 460 Bee brass I necked down to 338-378 that I posted earlier. Both the first stage at 378 and the final stage at 338-378 have the radius shoulder. That wasn't on the 460 brass I started with. On top of that belted cartridges head space on the Belt. Yes the shoulder will form a bit on firing but it is not critical nor will the re-sized 7 Rem Mag brass change much anywhere else.</p><p></p><p>Use your newly formed brass with a mid point load and test different COAL for best groups. This will give you fire formed brass. Once you find the best COAL, work up in powder charge till you find the highest velocity node, that produces good groups. This way you aren't wasting powder and barrel life.</p><p></p><p><img src="https://i.imgur.com/QKpMtTTl.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Dean2, post: 2727906, member: 26077"] I have formed 7 Rem Mag brass, you should have the Weatherby Radius shoulder after sizing. It doesn't need to be fire formed. Look at the picture of the 460 Bee brass I necked down to 338-378 that I posted earlier. Both the first stage at 378 and the final stage at 338-378 have the radius shoulder. That wasn't on the 460 brass I started with. On top of that belted cartridges head space on the Belt. Yes the shoulder will form a bit on firing but it is not critical nor will the re-sized 7 Rem Mag brass change much anywhere else. Use your newly formed brass with a mid point load and test different COAL for best groups. This will give you fire formed brass. Once you find the best COAL, work up in powder charge till you find the highest velocity node, that produces good groups. This way you aren't wasting powder and barrel life. [IMG]https://i.imgur.com/QKpMtTTl.jpg[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Making 257 wby brass from 7mm wby brass
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