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.
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)
ReplyDeleteIt 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.
ReplyDelete"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.