atmospheric pressures, temperature, elevation and so on do not impact any function of a gravity scale (once zeroed), this can not be said for digital scales. if you are reloading in a basement, out of the way of wind and you calibrate your digital, after 10 minutes of reloading, your very presence alone changes the pressure and temperature of the environment you're standing in. When I use to run test on digital scales we would have to put these scales in laboratory's confined with no atmospheric variables or human bodies to get a true calibration. one flaw I noticed early on is that by the simple motion of your hand hitting the 'zero' button on the scale can cause over a grain variation from true zeroing from the vortex created in air by simple motion. when your hand heads down toward the scale, there is pressure from the front of your hand as well as a continued downward force of wind pressure for up to 5 seconds after motion. the same with breathing in the same room as a digital scale! you will get very accurate measurements but they will never be true. too many variables unless you have a lab with a robotic arm design to not displace any atmosphere to get true results.
every one of my handloads will shoot up to 9/10 duplicates through a chronograph. Powder companies have spent a very large amount of money and time in the design of their powder. And, when you accurately measure this powder, it will burn exactly the same as the charge before displaying the exact pressure in any certain chamber. I weigh out every one of my bullets (not brass) and sort the variances to get this type of perfection. Premium bullet makers are very good with them so there are only about 10-15 out of 50 that are different than the others by usually less than .5 of a grain.
Isaac Newton is known for the first person to grasp this understanding and knew by erasing variables, outcomes become more precise. Think of all the variables that are needed for a digital scale to function properly. Too many for a simple man like me.
every one of my handloads will shoot up to 9/10 duplicates through a chronograph. Powder companies have spent a very large amount of money and time in the design of their powder. And, when you accurately measure this powder, it will burn exactly the same as the charge before displaying the exact pressure in any certain chamber. I weigh out every one of my bullets (not brass) and sort the variances to get this type of perfection. Premium bullet makers are very good with them so there are only about 10-15 out of 50 that are different than the others by usually less than .5 of a grain.
Isaac Newton is known for the first person to grasp this understanding and knew by erasing variables, outcomes become more precise. Think of all the variables that are needed for a digital scale to function properly. Too many for a simple man like me.
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