Every chart I find combines all the powder manufacturers into a single list.
I have previously found and printed a pdf which lists manufacturers at the top and then powders they make under it in relation to their burn rates. I really liked this chart and would like to print up a few more copies.
Does anyone know/have it bookmarked by any chance?
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The one that I know of that fits your description is in the Vihtavuori Reloading Manual. You can download the manual from here... http://www.lapua.com/index.php?id=850
"When I held that gun in my hand, I felt a surge of power...like God must feel when he's holding a gun." H. Simpson.
VV's chart would be a great tool...if it was accurate. However, I've noticed discrepancies when comparing relative burn rates to charts from other powder manufacturers.
"When I held that gun in my hand, I felt a surge of power...like God must feel when he's holding a gun." H. Simpson.
Originally posted by psychephylax: any ideas which ones are questionable?
I think you should rely on the manufacturer's website data (most have it posted). Also, powders can switch places on the list depending on the application they're used in.
Just because it's so easy to get a typo, I'd rely on manufacturer's data for their own powders. Even if you third party charts on agree, that could be because they copied each other's chart and propogated a typo or mistake.
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Originally posted by psychephylax: any ideas which ones are questionable?
VV shows that Hodgdon's BLC2 is faster than H335 whereas Hodgdon's rates BLC2 as slower than H335. That's just 1 example. Also, the relative burn rates of powders from manufacturer to manufacturer varies depending on who's chart you're looking at. So, I can't really depend on any of these charts to tell me that the powder of one manufacturer will burn the same as another manufacturer's powder that happens to be next to it on the chart. I would have to research each prospective individual powder in more detail.
"When I held that gun in my hand, I felt a surge of power...like God must feel when he's holding a gun." H. Simpson.
Originally posted by psychephylax: any ideas which ones are questionable?
They have Bullseye in the wrong brand column, and in my experience the wrong speed. For me, Red Dot would be before it (faster), and definitely they got HP-38 WAY wrong, and AA#5 in my experience and batch is WAY slower than Unique. Some of it could be a +/- 3% batch spec for propellants that are identical but different name i.e. HP-38/WW 231.
I always kinda liked the chart from Hodgdon pretty well:
Originally posted by signoir: VV's chart would be a great tool...if it was accurate. However, I've noticed discrepancies when comparing relative burn rates to charts from other powder manufacturers.
The burn rate will depend onthe testing methods. That's why all the burn rate charts are slightly diff. The burn rate chart is useful in choosing a powder but you should not use them for powder substitutions. Powders will change burn characteristics w/ bore size & charge wts.
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