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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
My shiny new light .338 Norma Magnum build thread!!
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<blockquote data-quote="codyadams" data-source="post: 1820037" data-attributes="member: 87243"><p>I forget where it is, but there is a post and a quote from Kirby Allen that speaks of it. Essentially what it boils down to is that you can't rely on common pressure signs (bolt lift, ejector mark, primer pocket stretch and so on) with these .585 bolt face cartridges with lapua and peterson type brass, by the time those pressure signs show up you are well into the 75,000 psi+ range, simply because the brass is so tough it can handle the pressure, but repeatedly pounding the action with pressures like that and a .585 bolt face can result in lug set back.</p><p></p><p>So you have to keep pressure within saami or cip spec by other methods, such as monitoring velocity. If you think you just "have a fast barrel" because your sending a bullet 100+ fps faster than what is common with no pressure signs on the brass, sorry but your likely over pressure. In a standard situation like a .308 bolt face on a short action, that is not an issue because that action can take it, you will just kill your brass a little sooner, and it may still last 10 rounds, but that is not due to the fact your within pressure range and somehow just have more speed, it's simply because you have very tough brass. But open that face up to .585, and it allows more of the pressure to be transferred to the bolt/lugs (specifically the lower lug that has less support due to the feed ramp), and you can have issues.</p><p></p><p>In other words, you have to be very careful not to overload the action. Not because your necessarily at risk of blowing it up, but because long term useage over pressure results in lug set back. According to Kirby Allen however, if your very careful to keep your pressures within spec, you will be just fine. As a side note, Remington has several model 700's that are chambered in .338 lapua, and they are standard 700 actions. Also, Christensen arms 338 normas and lapuas are all a standard rem 700 bolt/lug setup, and they state they have had no issues.</p></blockquote><p></p>
[QUOTE="codyadams, post: 1820037, member: 87243"] I forget where it is, but there is a post and a quote from Kirby Allen that speaks of it. Essentially what it boils down to is that you can't rely on common pressure signs (bolt lift, ejector mark, primer pocket stretch and so on) with these .585 bolt face cartridges with lapua and peterson type brass, by the time those pressure signs show up you are well into the 75,000 psi+ range, simply because the brass is so tough it can handle the pressure, but repeatedly pounding the action with pressures like that and a .585 bolt face can result in lug set back. So you have to keep pressure within saami or cip spec by other methods, such as monitoring velocity. If you think you just "have a fast barrel" because your sending a bullet 100+ fps faster than what is common with no pressure signs on the brass, sorry but your likely over pressure. In a standard situation like a .308 bolt face on a short action, that is not an issue because that action can take it, you will just kill your brass a little sooner, and it may still last 10 rounds, but that is not due to the fact your within pressure range and somehow just have more speed, it's simply because you have very tough brass. But open that face up to .585, and it allows more of the pressure to be transferred to the bolt/lugs (specifically the lower lug that has less support due to the feed ramp), and you can have issues. In other words, you have to be very careful not to overload the action. Not because your necessarily at risk of blowing it up, but because long term useage over pressure results in lug set back. According to Kirby Allen however, if your very careful to keep your pressures within spec, you will be just fine. As a side note, Remington has several model 700's that are chambered in .338 lapua, and they are standard 700 actions. Also, Christensen arms 338 normas and lapuas are all a standard rem 700 bolt/lug setup, and they state they have had no issues. [/QUOTE]
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My shiny new light .338 Norma Magnum build thread!!
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