LYMAN Pro 500 scale, WTF??

[powder burner]

For some reason this thing doesnt always give me an exact measure.

I put enough powder in the tray to give me the amount of grains I want, but it seems to take a lot one time and not much the other time to move the pendilum. I put the powder in the tray with a yellow little scoop thingy, then use a powder trickler to make an exact measure of powder.

I always tap the scale to make sure, sometimes its perfect and other times its definately too much powder.

I noticed this when looking into a case before seating a bullet and it seemed to have too much in it, i could tell just from looking.

So do I have a scale that is not so great, and should buy a RCBS model?

Or do these scales just do weird things once in awhile? I have double and triple checked to make sure my slides for the proper weight have not moved while reloading.


I was using IMR 4350 if that makes a difference in your answer. Would it just pack differently in different cases?

 

[ciphery]

Check to make sure that the balance beam is sitting in the "V" blocks properly.
If one side is in the V and the other is infront or behind, or if both sides are in front or behind the V, then the scale will not measure acurately or consistantly.

 

[paperslayer]

http://www.6mmbr.com/catalog/item/1433308/1266096.htm