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11-22-2019, 09:03 PM | #3 | ||||||
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11-22-2019, 11:32 PM | #4 | ||||||
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http://www.hodgdonreloading.com/relo...reloading-data
Matching Shot Type and Size to Reloading Data It is easy to assume that all shot types can be reloaded similarly; after all, they look the same – being round balls of metal. However, in loading shotgun shells, this assumption cannot be further from the truth. The two characteristics of shot that change reloading data are shot hardness and density. Shot hardness has a direct effect on chamber pressure. Softer shot produces lower pressure; harder shot raises chamber pressure dramatically. The softest shot type is lead. The hardest shot types are steel and tungsten. Bismuth falls between lead and steel. This is the primary reason that lead shot reloading data can never be used with any other type of shot. Shot density affects how much room in the shell case the shot charge will take up. To try to simplify shot density, think of it this way: A coffee cup of steel shot weighs less than a coffee cup of bismuth shot A coffee cup of bismuth shot weighs less than a coffee cup of lead shot A coffee cup of tungsten shot is heavier than all the others Just remember, in shotshell reloading the reload data must be specific to the type of shot being used. Hodgdon reloading data meets this requirement. |
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The Following 4 Users Say Thank You to Jerry Harlow For Your Post: |
11-23-2019, 03:05 PM | #5 | |||||||
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Thank you for breaking that down. Fully understand now. |
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11-23-2019, 05:20 PM | #6 | ||||||
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Swapping bismuth for lead does not concern me. See this thread:
http://parkerguns.org/forums/showthr...&highlight=Wsf I tested the same load twice: one test with 1.25 oz of bismuth and one test with 1.25 oz of lead. All else the same. I was not surprised when the velocity and pressure data were essentially the same for both loads. What’s heavier? 1.25 oz of bismuth or 1.25 oz lead? The difference in volume is easily accommodated with less fiber wad in the shot cup. -Victor |
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The Following 5 Users Say Thank You to Victor Wasylyna For Your Post: |
11-27-2019, 03:47 PM | #7 | ||||||
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Not trying to argue . There is plenty of data on the Hodgdon site you can compare for yourself .
Because Bismuth and Lead are close to the same density and hardness , as say Lead and steel . There may not be big difference , but there is difference . Enough difference that when you are shooting these loads in guns that require low pressure ammo it can easily put the load over pressure for said gun. Better yet call the people that do the actual ballistic testing . I'm sure they can explain better than I can. |
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11-28-2019, 06:54 AM | #8 | |||||||
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Have a Happy Thanksgiving, Ron
__________________
We lose ourselves in the things we love; we find ourselves there too. -Fred Bear |
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11-28-2019, 10:51 AM | #9 | ||||||
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Ron , Certainly didn't mean to offend you . Just want everybody to stay safe. But I will stick to what I said , a taller or "longer" load column will increase pressure every time , more surface area friction in the hull .
Hope you and yours have a Happy Thanksgiving also. Mark |
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The Following User Says Thank You to Mark Garrett For Your Post: |
11-29-2019, 07:36 AM | #10 | |||||||
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I guarantee you with 100% certainty that the longer yet lighter load column of rice will produce significantly less pressure than the shorter, heavier load column of lead. It's the weight of the load column and to a lesser extent the compressibility of the payload that determines the pressure of a given powder charge. It has virtually nothing to do with the length of the payload. That's why Victor's comments are spot on: "I tested the same load twice: one test with 1.25 oz of bismuth and one test with 1.25 oz of lead. All else the same. I was not surprised when the velocity and pressure data were essentially the same for both loads. What’s heavier? 1.25 oz of bismuth or 1.25 oz lead?"
__________________
We lose ourselves in the things we love; we find ourselves there too. -Fred Bear |
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