http://www.thehighroad.org/showthread.php?t=778104The video above, created by British shooter Mark (aka 1967spud), shows a 10-10 beam scale that has been “tuned” by Scott Parker. In the video, you can see that the 10-10 scale is now sensitive to one (1) kernel of powder. Mark also demonstrates the’s scale’s repeatability by lifting and replacing a pan multiple times. You can contact Mark via his website, www.1967spud.com. To enquire about balance-beam scale tuning, call Scott Parker at (661) 364-1199, or send email to: vld223 [at] Yahoo.com.
Assuming the scale at your wife's work is accurate, your scale is off 0.4% at a weight double or triple where it'll actually be used for powder. That doesn't strike me as a unreasonable for an inexpensive scale. Most labs I've worked in have a good quality "beater" set of calibration weights we'd loan out to other groups in the company. These are weights that were certified/traceable at one time but got relegated to loaner duty for some reason. Maybe your wife could bring them home and you could check your scale at a weight closer to where you'll be using the scale.grubbylabs said:So a Hornady 200 grain ELDX Bullet weighs 199.9-199.8 on my Charge master and my wife's scale at work. On my beam scale it weighs 200.6-200.8. So to me that's a pretty big swing.
at 30 grams it was 1 full grain off[/QUOTE
Not sure if this is a typo, of if my calculation is off, but 1 grain at 30 grams represents an error of about 0.2%. I'd be ok with that.