It's just part of finding out this stuff for myself.

"maybe, different solutions."
I like this thought Chuck.
Cary

You are putting some $$/effort into this if you've paid for Labview and the interface bits. Will be most interested in the pic's of your melt temp under PID control. The little $35 controller I've been using has fuzzy logic, so the longer you run it each casting session the better the control. Am also giving the pot a good stir with the ladle about every 4-5 bullets to insure there is no stratification in the melt.

No posts in a week. Stop goofing off and start casting and presenting the data.

Just cast 55 bullets in a PJ 38cal mould I recently purchased from a member here. Using 20-1 @ an indicated 775F and a ladle, the lightest bullet weighed 367.64gn and the heaviest weighed 368.54gn. Did not bother plotting the curve as can live with the 0.9gn variation (0.9/368=0.244%, close enough for gov't work). 

Assuming the rifle/load is capable of holding 1.5moa, that's about 8" at 547yd (500m). 1.00244x8"=well under 0.1" additional variation at that distance. This, of courses, assumes that everything is linear, based on bullet weight (I like simple).

Very simple. I gently place them one at a time on a GemPro 250 scale, which weighs to +/- 0.02gn. So is actually weighing to 2-hundredths of a grain. Was using a PACT scale that weighed to 0.1gn, but it was so slow to respond I figured almost anything was better. The GemPro 250 was the least expensive alternative that got decent reviews from the high power shooters (bench & long-range), who are a whole lot more anal than we are in their loading (for instance, some 'wash' their bullets in acetone to remove any residual mfg lube to insure consistency, etc.). Many of them think the GemPro 250 is not nearly good enough and use $500-1000 scales with even higher resolution. Here is where I got mine:
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Edit: John Boy posted this link earlier in this thread for a considerably less expensive alternative:
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I've ask Santa Claus to put one in my stocking as a back-up to the more expensive GemPro 250.

Did notice that there is no wallwart with the less expensive model, which is no biggie. The one that comes with the GemPro 250 is likely worth about $5. Have a much heavier 1A wall wart that will use once I figure out where I hid it. Was used with a phono-preamp, so is pretty decent. May not need it, but several folks have suggested using a ferrite noise suppressor on any AC powered feed, which I've done since I had one handy. They are about $2 if not. With a well regulated supply is likely not needed.

I wonder if you get into the upper end of the measuring range for this unit, i.e. 520 - 600gr if you will still get the same accuracy?  It seems sometimes when you get to the extremes on digital measuring devices accuracy suffers, especially on less expensive models.

Cary