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anonymouscuban

Taking the Plunge - Few Questions/Confirmation Needed

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No affordable scales measure to the hundredth of a grain. What you have is sufficient. Everything we do can be assumed to be +/-0.1gr and this it doesnt make a ton of sense to try to determine our precise load by throwing a bunch of charges and then averaging them.
 
Most powder drops throw +/-0.1gr with most powders. The fact that yours only threw 3.6 and 3.7 means you're throwing more precisely than that. So your powder measure is doing fine.
 
Your digital scale effectively rounds your charge weight. That means the 3.6gr will display but the charge weight is actually somewhere between 3.55gr and 3.64gr (see why the sticker says +/-0.1gr?). It will read 3.7gr on the display if the charge is between 3.65gr and 3.74gr. 3.64gr and 3.65gr are incredibly close together yet read different numbers. 0.01gr of powder is very likely less than 5 tiny kernels. Oh and the load cell performance likely varies with temperature, battery voltage or wall power fluctuations, tiny air currents (these aren't enclosed lab scales), florescent lighting etc. So a known check weight placed on the scale could display different results at different times!
 
All of this explanation to say that what you have is fine. In the beginning it's a bit hard not to hyper focus on being ultra precise. The instruments we have just aren't capable of being that precise with certainty.
 
If you want to be very consistent when working up loads for the chrono we can talk about trickling powder to try and eek some extra precision out of the scale.
 
Thanks for the sanity check. I guess seeing some of the load data posted around the net was setting some false expectations as far as accuracy of measure for me. What you explain totally makes sense. And its not like I'm trying to hit a fly at 1000 yards.



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I shot some blue bullets 125 grain yesterday I loaded up with 5.1 grains of Accurate No.5. They worked well and seemed very accurate out of my G19. I check my  powder drop every 50 to 100 rounds depending on if I am using a new powder.

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Well, I am back from the range with all fingers and my gun didn't blow up! All rounds ignited, properly cycled the gun and had no issues ejecting the spent cases. Overall, I would call it a success!

 

So again, no chrono yet so just plinked the 60 rounds I developed. 20 of each of the loads below...

0

147gr Blue Bullet FP

3.2gr tightgroup

WSP

1.150 COL

 

135gr Blue Bullet TC

3.5gr Tightgroup

WSP

1.148 COL

 

125gr Blue Bullet TC

3.7gr Tightgroup

WSP

1.162

 

It was hard to tell which load I preferred because I had to shoot my PCR. Just before leaving for the range, I dropped the guide rod of my SP-01 and it must have slid under the refrigerator because I couldn't find it. It's a huge Sub Zero so that things lost to the abyss. Good excuse to order a stainless guide rod. YAY!

 

That said, the 147 seemed softest and most accurate. Nice groups at 20 yards. No fliers. I wasn't shooting from a rest so hard to tell if the others were less accurate due to me. But if I shoot the 147 better, guess that's a moot point.

 

Now, onto a couple of questions about case head stamps and COL variances.

 

1. How anal should I be about variances in COL from round to round? Should I only care that they all chamber or are within the max COL? I'm not seeing huge variances. For example, the 135gr batch... 1.143 to 1.149 COL.

 

2. Do I need to separate my brass by head stamp? I started to do that and it's a royal pain in the butt. Will it reduce variance in COL? Is that why you separate cases? How critical is this step?

 

Thanks again for all the help guys.

 

 

 

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I don’t sort brass as far as variations in COL go unless you measure and sort there will be some variations. Just resize a few measure some even the same brand. You will be surprised.

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