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Powder PSI
I am wondering about PSI(pounds per square inch) on reloads regarding the powder. We see so many reloading charts about type of powder, grain of bullet, primers, crimp, etc. But when a bullet is seated while reloading and compresses the powder is there a measurement on the PSI pressure on the actual powder. And is it different in different loads? Is the actual PSI calculable or is it just "load by the chart".
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CBOB0716 "The most basic right that we have emanates from our Creator and it is that unalienable right to life. We stand firmly on the principle that from conception until the last breath is drawn, life is sacred.” Political Correctness is a doctrine, recently fostered by a delusional, illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of shit by the clean end! |
#2
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I get what you are asking but I don't think most rounds actually compress the powder when seating the bullet. I will have to get the calipers out and do some figure'n but any specific load you are thinking about???
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#3
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Am thinking about the .308. When seated, the compression of the powder. The bullet will not fire efficiently without compressing the powder, but is there a general PSI that the powder is compressed to to max it out while being safe?
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CBOB0716 "The most basic right that we have emanates from our Creator and it is that unalienable right to life. We stand firmly on the principle that from conception until the last breath is drawn, life is sacred.” Political Correctness is a doctrine, recently fostered by a delusional, illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of shit by the clean end! |
#4
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I get ya... I will ask my FIL about this. He is a rifle guy and been loading longer than I have. You are the first person to ever ask this on a forum that I am aware of. You must be one of those thinkers or something
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#5
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hehehehe...always need to know the specifics.
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CBOB0716 "The most basic right that we have emanates from our Creator and it is that unalienable right to life. We stand firmly on the principle that from conception until the last breath is drawn, life is sacred.” Political Correctness is a doctrine, recently fostered by a delusional, illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of shit by the clean end! |
#6
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Most loads aren't compressed. Usually they will have an abbreviation CL or something to indicate it is compressed as compression can increase the PSI quickly and dangerously. Some types of powder may take up more space in the case but very few actually squeeze the bullet down far enough to compress the powder. When creating a compressed load you fill the powder according to the weight of the charge which will fill above where the bottom of the bullet would seat. Then the projectile being seated will compress the load when seated to the OAL.
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CBOB0746 NRA Life Member Florida CWL Since 1992 Last edited by Gatorade; 05-05-2015 at 04:11 PM. |
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CBOB0716 "The most basic right that we have emanates from our Creator and it is that unalienable right to life. We stand firmly on the principle that from conception until the last breath is drawn, life is sacred.” Political Correctness is a doctrine, recently fostered by a delusional, illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of shit by the clean end! |
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Depending on the load yes. Sometes a lot,msometime a a little. I have some Trailboss that is a much fluffier powder to take up more space because 231 loaded in a 38-40 case woul only fill to about a third of the case. Then the powder sits on the bottom of the case and may not ignite correctly. Not enough to Squibb but maybe a lower velocity.
I loaded some .32 Magnum and could double charge the load without over flowing the case. That means single charge would take less than half of the case. Yes many times there is a bit of space between the top of the powder and the bottom of the bullet. So a compressed load would be over filled with powder and squeezed or compressed down. VERY DANGEROUS with a powder that the burn rate is not appropriate for a compressed load. For example, we load powder by weight. But 1 grain of W231 and 1 grain of AR Comp and 1grain of Trail Boss would all take up different volumes. Then compound the faster burn of the AR comp and you could have a high pressure spike than if you loaded the same volume of Trail Boss.
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CBOB0746 NRA Life Member Florida CWL Since 1992 |
#9
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NRA Life Member Wilson Combat CQB Kimber Tactical Pro II S&W J-Frame .38 ect " I don't own the clothes I'm wearin', and the road goes on forever " There's a gator in the bushes, and it's calling my name... COTEP #523 Last edited by Riverpigusmc; 05-05-2015 at 09:36 PM. |
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CBOB0716 "The most basic right that we have emanates from our Creator and it is that unalienable right to life. We stand firmly on the principle that from conception until the last breath is drawn, life is sacred.” Political Correctness is a doctrine, recently fostered by a delusional, illogical minority and promoted by a sick mainstream media, which holds forth the proposition that it is entirely possible to pick up a piece of shit by the clean end! |