Should I toss my rangemaster 750

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Strange. Things go bad.

I have been using the same model for many years. I check mine with calibration weights and a Redding #2 Balance and it is dead on.
When I calibrate it per internet instructions, it will calibrate on the 20g weight but with the 20 and 30 when it wants 50 it says error
 
When I calibrate it per internet instructions, it will calibrate on the 20g weight but with the 20 and 30 when it wants 50 it says error

Likely bad. Whenever I use mine, I go through the calibration steps every time.

When I said above I use calibration weights, I should have said I also check mine (once set up) with the separate check weights from the RCBS check weight set. I also do spot checks using my Redding #2.

If you can't get through the calibration steps, I'm at a loss.

Maybe someone here with more knowledge can help.
 
Before I would do anything with it that is destructive like taking it apart an email to RCBS might get it fixed. Just explain that it has been in a box unused for all this time and you just now found it is defective.
 
^
Worst they could say is it’s discontinued and you are out of luck.

Might get lucky and they send you a current replacement though. They definitely won’t without a call though. RCBS has always been good to me.
 
Calibrate with the 20g weight, zero and check with check weight or know weight object (bullet, coin, etc.). If still "bad" it's your decision to toss or send back...

I have never found a reloading digital scale that was as reliable as a plain old beam scale. Wandering zero, impossible/slow trickling up, and every one I've had when the pan is lifted, 75% of the time a different weight is shown when the pan replaced...
 
The error is probably due to over range, > 50g. Do you have the option to enter a different weight, or single point calibration?
I don’t know? My first electronic. It weighs the 20g weight at exactly 20g and I weighed some Sierra bullets and they were all very close to the advertised weight.
It wasn’t even close on the 30g weight.
 
Do you have your cell phone on or near your scale? If so, move the cell phone to 10 feet away. Cell phone is Tx and Rx signals for the variety of items running in the background.
 
Mine does the same thing. When I compare it to the balance scales it weighs correctly. I don't use it anymore, I just go old school. Old school works just as well.
I have a Lee balance scale. I’ll test it against it. probably never trust it.
It sat new in the box in a cold storage room in back of a machine shop for a few years
 
I will try to call RCBS. I’ve been having a hard time reaching them regarding a different product I wish to buy.
After some research I believe I’ll buy an RCBS 505.
I’ve had no problems with the Lee but it’s a pain to setup and see the adjustments.
 
I gave digitals a good try; the last one an FA Platinum series. Warmed up scale 15 minutes, AC powered. Turned off fluorescent lighting. Used one 100 watt incandescent light, 4' away from scale. Turned off CD player (speakers were 5' from bench). Closed all doors and windows. Left cell phone in the house. No power lines anywhere near shop (but meter is located 20' from bench and breaker box is 6' from scale). So, no electronic interference, no breeze, should be OK. Calibrated, set to grains, zeroed, tare set. Dropped a powder charge in pan placed the pan on tared scale and got a reading (in this case 4.8 Bullseye weight on my RCBS 5-10). Tried trickling up to 5.0. Slowly add a few granules, no change. Add a few more. weight jumps .3 gr up. Remove pan wait 3 seconds replace pan get a .2 gr lower reading. Repeat several times and use different powders and weights, up to 40 gr. The FA is the third digital I've owned and they all acted the same and two others had wandering zero and one would fluctuate between grains and grams, then could not be calibrated (Jennings).

So today I use my digital in conjunction with my beam scale (Ohaus/Lyman D5 or RCBS 5-10). I'll set my powder measure with my beam scale, weight the charge directly from my beam scale to the digital and notice the difference if any, I do this a few times and then use the digital considering the difference and double check with my beam scale every 5th or 6th charge.

I'm only sharing my experiences with digital scales for the benefit on new reloaders that may be lead to believe beam scales are "old school" and should be relegated to the old reloaders at the old folks home. Some may have good consistent, accurate results with digitals, but not me...
 
Fluorescent lighting and drafts from heating or AC are also known to interfere with these in addition to cell phones. I really think a call to RCBS is probably needed.
 
This looks and would seem to calibrate like a Hornady I have. I know that I have to push Ca AL again after I put the final weight on.

Attached is a screen cut fyi.
 

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