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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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<blockquote data-quote=".284" data-source="post: 904888" data-attributes="member: 19604"><p>I did a 7-300 mag so as to use a 300 win mag body die if needed. I used ptg for the reamer and spec'd it to be used with a separate throating die. I sent some dummy rounds in with the build which allowed me to have the bullet (180 Berger) still in the neck when it touches the rifling and also let me chase the lands a bit if needed as the throat erodes. Built on a remy there is lots of room in the mag to do this. The bearing surface is long enough too that they can be seated in a bit if you want more jump. Lots of capacity so you're not crowding powder space if you jump them further. </p><p>So far I have only fire formed some nosler brass and have yet to get to the range with my first reloads. I wasn't sure if the fire forming was needed but I didn't want to find out later that new brass changed the pressure enough to affect the accuracy.</p></blockquote><p></p>
[QUOTE=".284, post: 904888, member: 19604"] I did a 7-300 mag so as to use a 300 win mag body die if needed. I used ptg for the reamer and spec'd it to be used with a separate throating die. I sent some dummy rounds in with the build which allowed me to have the bullet (180 Berger) still in the neck when it touches the rifling and also let me chase the lands a bit if needed as the throat erodes. Built on a remy there is lots of room in the mag to do this. The bearing surface is long enough too that they can be seated in a bit if you want more jump. Lots of capacity so you're not crowding powder space if you jump them further. So far I have only fire formed some nosler brass and have yet to get to the range with my first reloads. I wasn't sure if the fire forming was needed but I didn't want to find out later that new brass changed the pressure enough to affect the accuracy. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Anyone own a 7mm 300 Win Mag?
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