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Posted: 2/11/2010 10:04:20 PM EDT
| My Speer manual shows most 9mm x 19 MIN loads beyond what my Hornady manual shows as MAX loads. Do I assume the Hornady manual is just being overly conservative and the Speer loads are safe? |
| I have found that looking at the manuals, and at the online resources there is a big difference between some of the data (depending on the bullets and powder used). I didn't assume anything until I worked them up for my pistol. Once I worked them up, I have to make that choice for myself. Personally, I think some of the loads that Hornady puts out are conservative (don't have a Speer yet). But that's just my opinion and in my guns. Better safe than sorry. |
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I have found that looking at the manuals, and at the online resources there is a big difference between some of the data (depending on the bullets and powder used). I didn't assume anything until I worked them up for my pistol. Once I worked them up, I have to make that choice for myself. Personally, I think some of the loads that Hornady puts out are conservative (don't have a Speer yet). But that's just my opinion and in my guns. Better safe than sorry. It's been the same in my experience. YMMV. |
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Newer Hornady data is lower than listed in older manuals after they started using peizo pressure transducers to measure chamber pressure.
Take the average of the maximum loads you find, from as many different sources that you can get in your hands. Calculate a start load 10% below that average maximum, but pay attention to other notes in the data that may warn against reducing the data below a certain charge weight - H110 loads when used in some cartridges will include this warning. Then as you work up towards the maximum charge weight, pay attention to the pressure when you approach the minimum of the maximum charges and if everything looks okay proceed on to the computed maximum. Think about the range of maximum charge weights you found as the range of possibilities, so the maximum charge for your combination of components and firearm could occur anywhere in that range. |
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Newer Hornady data is lower than listed in older manuals after they started using peizo pressure transducers to measure chamber pressure. Take the average of the maximum loads you find, from as many different sources that you can get in your hands. Calculate a start load 10% below that average maximum, but pay attention to other notes in the data that may warn against reducing the data below a certain charge weight - H110 loads when used in some cartridges will include this warning. Then as you work up towards the maximum charge weight, pay attention to the pressure when you approach the minimum of the maximum charges and if everything looks okay proceed on to the computed maximum. Think about the range of maximum charge weights you found as the range of possibilities, so the maximum charge for your combination of components and firearm could occur anywhere in that range. This is why I like the one caliber load data books in addition too a few full manuals....it makes a quick job of comparing the various recommended loads. |
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It would seem to me using Hornady's "conservative" data based on piezo electric transducer generated pressure readings would be the smart thing to do. Until today I never new they actually measured the pressure. I much prefer hard data to the old way of doing things.
Thanks AeroE |
| I have found some conflicting info also while reloading some 7mm Remington Magnums last week. I have 2 manuals that were somewhat close to one another and then the internet was off the charts compared to my manuals. I went with a start load of close to the bottom of what my manuals indicated and will work up from those. |
| The problem arises in the fact that the jackets in my experiences with Hornady bullets are somewhat softer than say the Sierra. Hornady bullets seem to come to pressure faster than Sierras in my testing. Bullets differ and so should your loading density when using a different manufacturers bullets. I use a lot of Hornady bullets and use thier manuals data to load them. |
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My Speer manual shows most 9mm x 19 MIN loads beyond what my Hornady manual shows as MAX loads. Do I assume the Hornady manual is just being overly conservative and the Speer loads are safe? You are going to see this with almost all manuals and cartridges. Which is why it's best to have many sources of data. Don't forget to check online data from the powder makers. I like to use the bullet makers data if possible, and work up from the start load. Always the safest way IMHO. |
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My Speer manual shows most 9mm x 19 MIN loads beyond what my Hornady manual shows as MAX loads. Do I assume the Hornady manual is just being overly conservative and the Speer loads are safe? Get used to it. The load data conflicts quite frequently, especially between those two. I find Hornady's data to be overly conservative, and I find Speer to be borderline dangerous unless you're using the exact components listed. I usually refer to data from powder manufacturers as the basis for my loads, especially Hodgdon. |
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Quoted:
Newer Hornady data is lower than listed in older manuals after they started using peizo pressure transducers to measure chamber pressure. Take the average of the maximum loads you find, from as many different sources that you can get in your hands. Calculate a start load 10% below that average maximum, but pay attention to other notes in the data that may warn against reducing the data below a certain charge weight - H110 loads when used in some cartridges will include this warning. Then as you work up towards the maximum charge weight, pay attention to the pressure when you approach the minimum of the maximum charges and if everything looks okay proceed on to the computed maximum. Think about the range of maximum charge weights you found as the range of possibilities, so the maximum charge for your combination of components and firearm could occur anywhere in that range. This excellent advice. |
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Quoted:
Quoted:
Newer Hornady data is lower than listed in older manuals after they started using peizo pressure transducers to measure chamber pressure. Take the average of the maximum loads you find, from as many different sources that you can get in your hands. Calculate a start load 10% below that average maximum, but pay attention to other notes in the data that may warn against reducing the data below a certain charge weight - H110 loads when used in some cartridges will include this warning. Then as you work up towards the maximum charge weight, pay attention to the pressure when you approach the minimum of the maximum charges and if everything looks okay proceed on to the computed maximum. Think about the range of maximum charge weights you found as the range of possibilities, so the maximum charge for your combination of components and firearm could occur anywhere in that range. This excellent advice. The first part was taught to us by FriscoPete. I combined that with my own, old method in the second part. |
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