5-0-5 check weight results

[Lead hammer]

Just thought I would post what I found. Used an RCBS kit. 10year old Ohaus 5-0-5.
.5gr=.5
1=1
2=2
5=5
10=bout 9.95
20=19.9
50=49.7
100=99.2
200=198.4

My .270 load is 59 grains, and would actually be 58.7 corrected.
All my pistol loads are bang on apparently.
I will have to check out my current 110 grain Blackhorn load and bump it up a tad.

 

[kc34]

Thanks for the info.

 

[titch--]

Always wondered if this scale was bang on or not.

thx

 

[SND]

Do they say anywhere what ASTM class those weights are supposed to meet?

makes a difference...

 

[Lead hammer]

I can read the manual when I get home and see. The paired weights in the set did read the same.

 

[dusticles]

I find my 505 will drift as well, probably dust and crud causing friction under the beam.

I have a Lyman weight set that allows me to check weight at every 0.5 grains. If I'm loading 44.7 grains of powder I will set the scale to be bang on at 44.5 and check 45.0

Another quirk I've noticed is that I have to keep the beam to the same side of the base or else I could get a difference of 0.2-0.3grains

 

[Lead hammer]

Do they say anywhere what ASTM class those weights are supposed to meet?

makes a difference...

Can't find anything, send RCBS an e-mail.....

 

[silverfoxdj]

Thanks I have one of those scales and just bought that weight set so very interested in your findings...

There was a post somewhere about the RCBS check weights being slightly off..

 

[Pocisk]

You need a check weight weight check to check your check weight weight.

Thanks I have one of those scales and just bought that weight set so very interested in your findings...

There was a post somewhere about the RCBS check weights being slightly off..

 

[Lead hammer]

I did find one story about a Lyman set (looks to be the exact same as RCBS ) that was compared on a very expensive lab scale and was surprisingly close, but who knows. By the looks of my results I think my scale is slightly off, as the weight grows so does the error. How good is the shoppers drug mart scale lol.

 

[KellyP]

Gentlemen,
If you need weights to verify your scales check out a company called "canadaweigh". Based out of BC, I just ordered weights for pretty much a few bucks including shipping. You can buy a set or individuals, check them out and they arrive in 3-5 days after you order. Also got my jrs50 scale there, for both scale and weights it was under 25 cdn to my door. Digital is always a good second measure to ensure the scales are accurate.

 

[silverfoxdj]

Are the check weights in grains or grams ?

 

[Lead hammer]

They look nicer in the picture but have no certification, and are in grams.
Does anybody actually zero for the weight they are loading?

 

[Lead hammer]

RCBS e-mail states NIST class F. Now what does that mean?????
NIST Classes

NIST Class F - Primarily used to test commercial weighing devices by state and local weights and measures officials, device installers, and service technicians. Class F weights may be used to test most accuracy Class III scales, all scales of Class IIIL or IIII, and scales not marked with a class designation.


Lower resolution scales may only come with ASTM Class 6 (equivalent to OIML class M2) calibration weights. A 50g Class 6 calibration weight can vary by as much as ±7mg (±0.007g / ±0.107grain) and a 100g calibration weight can very by as much as ±10mg (±0.010g / ±0.154grain).

Pretty sure the RCBS/Lyman sets are poor, but it may actually match the scales ability.


Now to see what class the 5-0-5 is. (sent an e-mail back to RCBS about the class of the scale.)

A person should find the highest tolerance bullet available, ( if it's better than the check weights) and buy a few boxes of light as possible to heavy as possibly and keep only one of each. Sell them to the next guy. Would be cheep check weights for whoever wants them.