Powder weight per volume

[Slidestop]

I just recently changed from N320 to Tightgroup on my press just to test a particular load I'm testing.

I don't use Tightgroup that much, and I'm quite fond of N320.

I didn't change from the N320 setting, and dropped a charge to see where I was at.

The Tightgroup weighed much, much more than the N320 at the same volume.

Of course, I adjusted my powder drop to the correct charge, but, I was surprised to see that the Tightgroup weighed that

much more than the N320 at the same volume.

Is that normal? Thinking that Tightgroup is more dense, and smaller particles, I can kind of see the difference.

George.

[peterthefish]

Yes, it's normal. Lee publishes a chart of volumetric density for most powders since their drops are volume based. It's helpful for me because I use a micrometer powder drop and can get in the ballpark for a new powder quick by checking it's density against a known powder.

http://www.leeprecision.com/cgi-data/instruct/VMD%27S.pdf

Shows TG is about 50% more dense than N320 (ie a measure setting that gets you 4 GR N320 will get you ~ 6 GR Titegroup).

Edited February 28, 2015 by peterthefish

[Slidestop]

Thanks for the link!