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Long Range Hunting & Shooting
300 Norma Magnum Improved reamer and die release
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<blockquote data-quote="Mad Minion" data-source="post: 2383169" data-attributes="member: 107917"><p>Not sure I'm conveying correctly, forgive me. Let me see if I can say this another way.</p><p> I picked a bullet, in this case a 245 Berger, I wanted it to acieve at minimum 3000 FPS, I looked at every 30 cal cartridge with potential to achieve my numbers. The 300 norma mag kept me in the mag. Was available, and others were already doing it.When I looked at the ballistics I would need to modify the case. Being an American and because I can I wanted to shove as much powder in the case as possible, I blew out the case wall and increased the shoulder angle to a point where the bullet would not seat into the powder column at all and still have enough neck left on the bearing surface of the bullet, at least .250 contact. The berger has a long boat tail. To do all of this I also had to maintain the headspace of the 300 Norma case because that would keep it all inside the magazine. What I found crunching numbers, 36.5 degrees on the shoulder would keep the bullet out of the powder. Give me .020 to chase lands and stay in the magazine for the life of this barrel. All without messing with the headspace and still maintain an acceptable amount of bearing surface in the neck. At 40 degrees I had little room to chase lands for the life of the barrel. 30 degrees was un American.</p><p> So, to maintain the integrity of my intent a 40 degree shoulder would not work for me.</p><p> Hope this clears things up.</p></blockquote><p></p>
[QUOTE="Mad Minion, post: 2383169, member: 107917"] Not sure I'm conveying correctly, forgive me. Let me see if I can say this another way. I picked a bullet, in this case a 245 Berger, I wanted it to acieve at minimum 3000 FPS, I looked at every 30 cal cartridge with potential to achieve my numbers. The 300 norma mag kept me in the mag. Was available, and others were already doing it.When I looked at the ballistics I would need to modify the case. Being an American and because I can I wanted to shove as much powder in the case as possible, I blew out the case wall and increased the shoulder angle to a point where the bullet would not seat into the powder column at all and still have enough neck left on the bearing surface of the bullet, at least .250 contact. The berger has a long boat tail. To do all of this I also had to maintain the headspace of the 300 Norma case because that would keep it all inside the magazine. What I found crunching numbers, 36.5 degrees on the shoulder would keep the bullet out of the powder. Give me .020 to chase lands and stay in the magazine for the life of this barrel. All without messing with the headspace and still maintain an acceptable amount of bearing surface in the neck. At 40 degrees I had little room to chase lands for the life of the barrel. 30 degrees was un American. So, to maintain the integrity of my intent a 40 degree shoulder would not work for me. Hope this clears things up. [/QUOTE]
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300 Norma Magnum Improved reamer and die release
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