Well I tried some Unique powder today in my RCBS Uniflow
The grains are much larger than the Acura #5 and make it easier to handle and far less likely to spill.
It also gave better numbers
Count 70
Min 5.8
Average 5.966
Max 6.1
Stdev 0.0796
Within 99% 5.76< X <6.17
3 sigma 99.73% 5.73< X <6.20
Within 99.99% 5.66< X <6.28
The Max-Min divergence is much better, and the Stdev is better too.
I'm also running into resolution and accuracy issues with my scale. I've found I have to wait when the AC is on. A deflection means was selected in GBC.
When I get my own copy of the Lyman book I can check more centered in the safe range (4.8 to 6.2 grains). Here I was just running with 6.0 as my point of aim.
But I think with this powder I could have better results.
I'll need to test at the range of course.
One warning I did get was that Unique burns very dirty.
2 comments:
y'know, if yer gonna be right at the bleeding edge of max loads for .45 ACP, you might want to look at .45 Super cases. (http://en.wikipedia.org/wiki/.45_Super).Available at midway (http://www.midwayusa.com/product/941217776/starline-reloading-brass-45-super)
It is thicker brass, which should help the sort of failure you are trying to avoid.
As always, work up to the load.
Bleeding edge? Lord no.
"When I get my own copy of the Lyman book I can check more centered in the safe range (4.8 to 6.2 grains). Here I was just running with 6.0 as my point of aim."
Unless I have a pressing need I'm going to /stick/ at the staring load.
Maybe work up by a couple tenths of a grain to ensure my sigmas fall within the safe zone.
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