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Rifles, Reloading, Optics, Equipment
Reloading
No signs of over pressure?????
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<blockquote data-quote="Shane1" data-source="post: 801457" data-attributes="member: 30532"><p>You don't always see signs of pressure with a 300 win mag ecpecially if brass in new or even once fired. If you watch the chrono you'll notice the velocity increase drops off when you get to pressure. example- if 1/2 grain from 73 to 73.5 to 74 gives you 50 fps each then 74-74.5 only gives you 20 your at max pressure, chambers are generous on 300wm and brass is usually undersized alot. I've seen 20 thousandths stretch at the shoulder before, sometimes has to be shot 2 or 3 times in my gun before shoulder is pushed far enough forward to touch, I believe this obscures the pressure to an extend. I can shoot 78 grains h1000 in win brass thats new or once fired (hot load) with no pressure, when the case gets to where I need to bump the shoulder (fully fire-formed) that same load will cause extractor marks and sticky bolt lift. Be careful you may be over 70,000 psi before you realize it. </p><p>Be safe, Shane.</p></blockquote><p></p>
[QUOTE="Shane1, post: 801457, member: 30532"] You don't always see signs of pressure with a 300 win mag ecpecially if brass in new or even once fired. If you watch the chrono you'll notice the velocity increase drops off when you get to pressure. example- if 1/2 grain from 73 to 73.5 to 74 gives you 50 fps each then 74-74.5 only gives you 20 your at max pressure, chambers are generous on 300wm and brass is usually undersized alot. I've seen 20 thousandths stretch at the shoulder before, sometimes has to be shot 2 or 3 times in my gun before shoulder is pushed far enough forward to touch, I believe this obscures the pressure to an extend. I can shoot 78 grains h1000 in win brass thats new or once fired (hot load) with no pressure, when the case gets to where I need to bump the shoulder (fully fire-formed) that same load will cause extractor marks and sticky bolt lift. Be careful you may be over 70,000 psi before you realize it. Be safe, Shane. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
No signs of over pressure?????
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