Looking to start sifting before winter. ;)
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Looking to start sifting before winter. ;)
What are you sifting? Ken
I presume you wish to sift powder. It works extremely well with ball powder. Here is a site that will tell you more than you want to know:
http://mywebpages.comcast.net/jesse99/sieving.html
Dale53
Interesting read. But, i must wonder, if the powder manufacturers are purposely putting the different size graduations in there, to control burn speed? That would be the appearance, according to his shooting tests. Of course, the finer grains will burn hotter, there being more surface area ignited at firing.
I would like to sieve my black powder at times, to get out finings and dust, but must wonder about the necessity of doing modern powder.
We use these sieves where i work.
http://www.ascscientific.com/sieves.html
Michael
I did a fair amount of hold/pass testing using a Cal-Graf screen.
http://castboolits.gunloads.com/show...41&postcount=8
I used this BP-centric equipment: (the screen anyway)
http://cal-graf.com/
http://cal-graf.com/screen.html
http://cal-graf.com/pour.html
It makes a big difference in SDs when your powder goes from 20-80% 4F to 100% 3F.
If you want to try your own screens, this is from the old Shooters BPCR forum...
[Date: 07/23/00-18:52
Who: Harry
13908: BP Grain Size?
OK guys, if this works I attach a copy of some information on BP grain sizes that I cut out of a post in my archives. It compares the Swiss numeric system with the good old fashioned American system of powder designation. Glenn
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If it is any help. I will go over their grain sizes compared to our grain sizes. Swiss number designation is first, followed by an approximation of how it would fit into our system.
#1. (4f), .508 mm to .226 mm (32 mesh to 60 mesh)
#2. (3f), .870 mm to .508 mm (18 mesh to 32 mesh)
#3. (2f), 1.36 mm to .670 mm (12 mesh to 24 mesh)
#4. (1.5f), 1.36 mm to .90 mm (12 mesh to 18 mesh)
#5. (1f), 1.6 mm to 1.2 mm (10 mesh to 14 mesh)
American grain sizing (includes Elephant)
1f, 12 mesh to 16 mesh
2f, 16 mesh to 30 mesh
3f, 20 mesh to 50 mesh
4f, 50 mesh to -200 mesh
If you look at the Swiss #4 powder (1.5f) you see that it is the coarse
half of the 2f (#3) powder. Compared to the American sizing, the Swiss
1.5f (#4) is really very close to the U.S. 1f in size with the Swiss #5
(1f) being actually the next size larger than our American 1f size
range.]
The Cal-Graf sifter was mentioned there, and I'd bet that Buffalo Arms carries one. I've got a bit more saved on the topic if you're interested. Stan
www.mscdirect.com NJMJ
I went to the fabric store and bought some fine nylon mesh, built a small four sided box and stretched it across the bottom. It works like a charm.
I never bother screening Swiss anymore. It has nowhere near the dust that Goex and pyrocap has.