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Rifles, Reloading, Optics, Equipment
Reloading
Question on finding pressure
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<blockquote data-quote="Arkansasdad" data-source="post: 3038172" data-attributes="member: 76766"><p>Usually the velocity shelf will will be below the max pressure for a load. I load eight rounds of each different recipe before going to the range. (kind of like shooting 3 round groups or shooting 5 round groups, the difference is astounding) This gives me good data to track each particular load. One of the best things loading 8 does is it will tell me about deviance in each recipe, another thing is it allows me to shoot a hot barrel and it will cycle through a mag and into the next one. You will be surprised at the difference in the amount of things that more rounds of one recipe will let you know. I usually (used to are the key words here, age is creeping in) would take all day to shoot a ladder for a barrel. After shooting the eight I would leave rifle bolt open, barrel up, in the shade, mag out and by the time I walked down to retrieve my target and looked it over and returned, ran a brush and a patch the barrel would be cool. This let me start out with a cold shot and progress. Some particular recipes wouldn't be shot after a couple shots because I knew they were not what I was looking for. I would record the avg. velocity for each recipe as the particular shots would progress in powder volume, somewhere as I made the graph and at a point the velocity would fall or even out with more powder in the case. I usually would shoot another or maybe two recipes to make sure. Most of the time the last load before the flat or drop would be the best for powder efficiency and accuracy. Some times the accuracy would be a recipe or two under but not usually. Powder efficiency is very important because it gives a better burn and over this amount may give a few extra fps but at the cost of accuracy and shortened barrel life. After you have shot a few thousand rounds this will all make sense. I have shot out many barrels and I can tell you top velocity is not even close to top accuracy. If you ask most people who shoot .308 Win. they are shooting velocities less than 2650 usually around 2610 not nearly a max velocity. No use to shoot when you cannot hit a house when sitting inside of it. Happy shooting.</p></blockquote><p></p>
[QUOTE="Arkansasdad, post: 3038172, member: 76766"] Usually the velocity shelf will will be below the max pressure for a load. I load eight rounds of each different recipe before going to the range. (kind of like shooting 3 round groups or shooting 5 round groups, the difference is astounding) This gives me good data to track each particular load. One of the best things loading 8 does is it will tell me about deviance in each recipe, another thing is it allows me to shoot a hot barrel and it will cycle through a mag and into the next one. You will be surprised at the difference in the amount of things that more rounds of one recipe will let you know. I usually (used to are the key words here, age is creeping in) would take all day to shoot a ladder for a barrel. After shooting the eight I would leave rifle bolt open, barrel up, in the shade, mag out and by the time I walked down to retrieve my target and looked it over and returned, ran a brush and a patch the barrel would be cool. This let me start out with a cold shot and progress. Some particular recipes wouldn't be shot after a couple shots because I knew they were not what I was looking for. I would record the avg. velocity for each recipe as the particular shots would progress in powder volume, somewhere as I made the graph and at a point the velocity would fall or even out with more powder in the case. I usually would shoot another or maybe two recipes to make sure. Most of the time the last load before the flat or drop would be the best for powder efficiency and accuracy. Some times the accuracy would be a recipe or two under but not usually. Powder efficiency is very important because it gives a better burn and over this amount may give a few extra fps but at the cost of accuracy and shortened barrel life. After you have shot a few thousand rounds this will all make sense. I have shot out many barrels and I can tell you top velocity is not even close to top accuracy. If you ask most people who shoot .308 Win. they are shooting velocities less than 2650 usually around 2610 not nearly a max velocity. No use to shoot when you cannot hit a house when sitting inside of it. Happy shooting. [/QUOTE]
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Question on finding pressure
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