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Rifles, Reloading, Optics, Equipment
Reloading
Be careful, myths about pressure signs.
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<blockquote data-quote=".280Rem" data-source="post: 205254" data-attributes="member: 11140"><p>This is where people get in to trouble with Quickload. The powder charge is irrelevant. It's the velocity you should look at and corrolate with the pressure. </p><p> </p><p>Example: I loaded my Remington M700 24" bbl .280 with 58grs of N160 behind a 140 Ballistic Tip. At the range a 3 shot string gave the following chronograph readings. 3165, 3159, 3162. Very fast...too fast in fact, though it showed no "classic pressure signs". I had a buddy run N160 with 140 BT (with default settings). I seat my bullets out to the lands, so the default seating depth would be less case capacity. Anyway, it puts me in the ball park. It said 58grs should give 57Kpsi, but it also said it would be at 2900fps. Looking down to the velocity I was getting, It said something like 62grs and 74Kpsi. Well, 62 grains would be waaaaaay too much. I read the pressure at the velocity, not the powder charge. Having talked to a couple of gun writers about it, they'll tell you the same thing. Sometimes the powder charges are way off. The velocity, with the given powder, determines your pressure.</p></blockquote><p></p>
[QUOTE=".280Rem, post: 205254, member: 11140"] This is where people get in to trouble with Quickload. The powder charge is irrelevant. It's the velocity you should look at and corrolate with the pressure. Example: I loaded my Remington M700 24" bbl .280 with 58grs of N160 behind a 140 Ballistic Tip. At the range a 3 shot string gave the following chronograph readings. 3165, 3159, 3162. Very fast...too fast in fact, though it showed no "classic pressure signs". I had a buddy run N160 with 140 BT (with default settings). I seat my bullets out to the lands, so the default seating depth would be less case capacity. Anyway, it puts me in the ball park. It said 58grs should give 57Kpsi, but it also said it would be at 2900fps. Looking down to the velocity I was getting, It said something like 62grs and 74Kpsi. Well, 62 grains would be waaaaaay too much. I read the pressure at the velocity, not the powder charge. Having talked to a couple of gun writers about it, they'll tell you the same thing. Sometimes the powder charges are way off. The velocity, with the given powder, determines your pressure. [/QUOTE]
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Be careful, myths about pressure signs.
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