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Rifles, Reloading, Optics, Equipment
Reloading
.30-06 and IMR 4955 or Superformance
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<blockquote data-quote="Lefty7mmstw" data-source="post: 1199039" data-attributes="member: 48043"><p>There isn't any such thing as on the edge of over pressure. You are either over 60Kpsi (I'll give you 65Kpsi in a strong modern action) or you are not. If you think you are on the "razor's edge" you are likely over 70Kpsi already, as most decent brass will not deform a bit until you have passed around 70Kpsi. My old 7stw wouldn't even deform brass at 75Kpsi when I had a strain gauge on her. </p><p>The safety margins get very thin when you push a rifle. The action may take it, but the primer may not; the brass may not either if thinned by a few firings. The throat of your rifle will burn out quicker too if the pressure is higher. I will go to a bigger cartridge every time and let her loaf along. You have to pay to play in this game if you want performance. Cheat the system by pushing a given cartridge and you will eventually get burned.</p><p>As to the '06 AI... It is smoke and mirrors... plain and simple. With the shoulder angle being the primary capacity gain, you are only gaining a couple of percent case capacity. You will gain velocity at 1/2 the case capacity increase at equal pressure; an extra inch of barrel on a standard '06 will likely gain as much or more speed. The steeper shoulder angle limiting bolt thrust is where you get your gains here, not case capacity. Shoot a '06 like a '06 and get a 300mag. if you want more. </p><p>I've got a '06 a 300win, and two 300rum rifles. They all have their place. I run 150's at 2900 or 165's at 2820 in the '06, 165's at 3250 in the 300win, and either 180's at 3300 or 225's at 3,000 in the 300rum rifles. I don't always want a 30cal. with the bark of the rum; I go to my '06 for that. My 300win is a good all around mid range deer slayer; she has more deer on her than my other rifles combined at present.</p></blockquote><p></p>
[QUOTE="Lefty7mmstw, post: 1199039, member: 48043"] There isn't any such thing as on the edge of over pressure. You are either over 60Kpsi (I'll give you 65Kpsi in a strong modern action) or you are not. If you think you are on the "razor's edge" you are likely over 70Kpsi already, as most decent brass will not deform a bit until you have passed around 70Kpsi. My old 7stw wouldn't even deform brass at 75Kpsi when I had a strain gauge on her. The safety margins get very thin when you push a rifle. The action may take it, but the primer may not; the brass may not either if thinned by a few firings. The throat of your rifle will burn out quicker too if the pressure is higher. I will go to a bigger cartridge every time and let her loaf along. You have to pay to play in this game if you want performance. Cheat the system by pushing a given cartridge and you will eventually get burned. As to the '06 AI... It is smoke and mirrors... plain and simple. With the shoulder angle being the primary capacity gain, you are only gaining a couple of percent case capacity. You will gain velocity at 1/2 the case capacity increase at equal pressure; an extra inch of barrel on a standard '06 will likely gain as much or more speed. The steeper shoulder angle limiting bolt thrust is where you get your gains here, not case capacity. Shoot a '06 like a '06 and get a 300mag. if you want more. I've got a '06 a 300win, and two 300rum rifles. They all have their place. I run 150's at 2900 or 165's at 2820 in the '06, 165's at 3250 in the 300win, and either 180's at 3300 or 225's at 3,000 in the 300rum rifles. I don't always want a 30cal. with the bark of the rum; I go to my '06 for that. My 300win is a good all around mid range deer slayer; she has more deer on her than my other rifles combined at present. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
.30-06 and IMR 4955 or Superformance
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