Simple version.
It's a flame chart.
Think of it as heat units given off when the same volume of different powders is ignited in the same space and environment.
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Vihtavuori powder
- Thread starter Cnkhunting
- Start date
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It's a flame chart.
Think of it as heat units given off when the same volume of different powders is ignited in the same space and environment.
Try 560 or 565 for 7mm or prc. edit I have switched to Vv for just about everything .
This is true with all powders. Depending on the climate you live in. In a high humidity environment powders absorb moisture, slowing their burn rate, and in a desert environment they dry out, increasing their burn rate. I have experienced this, in both environments.
Here's a rabbit hole for ya:
How does humidity affect powder?
You may have heard about a relationship between humidity and bullet velocity either in a book, on a reloading forum, or from a crusty benchrest shooter right after saying they get better ES/SD̵…
chronoplotter.com
Last edited:
Silver_Is_Money
Well-Known Member
The KiloJoules of Energy contained within each Kilogram of powder. It has nothing to do with burn rate or charge weights.
I have 2 lbs of N570 that I don't need. I paid $50 per lb. Glad to sell it.
Been using N550 for years in my .300 WSM and will keep using it. Elk in freezer almost every year. 62.5gr N550 over 180 gr Nosler Partition.
Knight
Well-Known Member
Some years ago I read an article that one of these powders can turn acidic with age and can self ignite. I don't remember what number so I discontinued using Vihtavuori powder altogether.
Heat Index for the respective powders.
Knight
Well-Known Member
I clearly remember looking into a bottle and noticing a slight yellow hase on the powder and it had a acidic smell. This was about 38 years ago. I'm sure it has been corrected by the manufacturer and not to worry any longer. I personally continue using the most common brands IMR etc.
Cnkhunting
Well-Known Member
It's 26" and I'm using h1000 and rl26 with my loads now. Thinking of trying the b powders and get a few pounds on hand that I know work just to have back up
deputyrpa
Well-Known Member
- Joined
- Oct 9, 2011
- Messages
- 176
The you can probably go with a slower powder like N570, but you'll most likely have a full case with a bit of a crunch at max pressure.
Gary in MD
Well-Known Member
Where is N-160 ?
Seabeeken
Well-Known Member
Just didnt include it
