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Yesterday, I forgot to warm up my RCBS (PACT) Powder Pro digital powder scale. After loading about 50 cases, I noticed that when I placed the empty scale pan on the scale it read 1 grain. Sure enough the "zero" had wandered and all of my loads were about 1 grain light. After breaking down the 50 loads, fortunately I had only set the bullets on the belled cases and hadn't seated them, I had to trickle in the the rest of the required load.

Conclusion:

1) MOST IMPORTANT, ALWAYS ALLOW THE SCALE TO WARM UP FOR AT LEAST 20 MINUTES.
2) Watch what you are doing, frequently check the scale to make sure the "zero" hasn't wandered. This is easily accomplished by setting the empty scale pan on the scale. It should read zero.
3) This may be controversial - Always charge all your cases then check the powder levels in them in good light compared to the others. Empty cases and double charges will stand out. I don't think it is a good idea to charge a case, and immediately seat the bullet.
 

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Don, I'm with ya on #3 specially, no controversy as far as I'm concerned, it's the last chance I get to make sure I haven't made a big mistake that could have very unhappy consequences. :wink:

Tim
 

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#3 is also important if it is possible for any foreign objects to have gotten into the cases. I have occasionally had flies die inside a case or also, sometimes, had a bit of polishing media get stuck in their. A fly would oprobably burn off without much problem but I suspect media might increase pressures a bit. Of course, these aren't much of a concern in straight-walled cases but bottlenecked.......
 
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