I know that sounds like a dumb question but …
I had always thought that +/- .1gr meant the scale arm may read a tad under or over but it's still giving the correct weight . Meaning If you zeroed the scale at 5.0 grains and your charge weighs 4.9gr it could still be 5.0gr or 4.9gr but its not likely 4.8gr . Thinking it is the scale arm that is off rather then the weight it self .
After reading another thread I now think it means no matter what your scale is saying the charge is . It could be +/- .1gr from "that" reading ? So a 5gr zero and the charge reads 4.9gr . The actual charge could be 4.8 , 4.9 or 5.0gr ?
That's a big deal , especially for those weighing there charges in .3gr increments or less in rifle loads and almost seems impossible to get accurate weights when working up pistol loads when there is less the a grain of charge weight between min & max ?? I mean there are some pistol loads that are only .5gr between min & max . If your scale could be off that much why bother working up a load between the .5gr difference ? Just pick the middle charge and go shoot ???
Did that firearm show similar signs on other load work ups or was this the first time loading for that firearm . I ask because if you firearm has not shown a tendency to produce high pressure in multiple other loads . Can one infer it's not likely going to in the next combo you try assuming you are with in the established min & max charges ??
Not sure it changes much for me but is interesting when I think I likely have been wrong this whole time when it comes to how I understood the +/- .1gr variance .
I had always thought that +/- .1gr meant the scale arm may read a tad under or over but it's still giving the correct weight . Meaning If you zeroed the scale at 5.0 grains and your charge weighs 4.9gr it could still be 5.0gr or 4.9gr but its not likely 4.8gr . Thinking it is the scale arm that is off rather then the weight it self .
After reading another thread I now think it means no matter what your scale is saying the charge is . It could be +/- .1gr from "that" reading ? So a 5gr zero and the charge reads 4.9gr . The actual charge could be 4.8 , 4.9 or 5.0gr ?
That's a big deal , especially for those weighing there charges in .3gr increments or less in rifle loads and almost seems impossible to get accurate weights when working up pistol loads when there is less the a grain of charge weight between min & max ?? I mean there are some pistol loads that are only .5gr between min & max . If your scale could be off that much why bother working up a load between the .5gr difference ? Just pick the middle charge and go shoot ???
Unclenick said:Never fail to fire the minimum load or a load 15% below maximum, whichever is higher, as your first test round. I've run into starting loads that were already too warm for the particular gun I was trying them in.
Did that firearm show similar signs on other load work ups or was this the first time loading for that firearm . I ask because if you firearm has not shown a tendency to produce high pressure in multiple other loads . Can one infer it's not likely going to in the next combo you try assuming you are with in the established min & max charges ??
Not sure it changes much for me but is interesting when I think I likely have been wrong this whole time when it comes to how I understood the +/- .1gr variance .
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