View Full Version : How is it determined?
JohnH
12-02-2005, 11:56 PM
Fella comes up with a new case, How is an appropriate powder decided on??? An why is it that in some cases, straightwalls particularly, that powders which are a tad slower than the normally accepted speeds seem to give higher velocities than they might seem to just looking at a burn chart. 2495 comes to mind in the 38-55 and R15 as well as 4064 comes to mind in the 30-30
buck1
12-03-2005, 09:07 PM
Fella comes up with a new case, How is an appropriate powder decided on??? An why is it that in some cases, straightwalls particularly, that powders which are a tad slower than the normally accepted speeds seem to give higher velocities than they might seem to just looking at a burn chart. 2495 comes to mind in the 38-55 and R15 as well as 4064 comes to mind in the 30-30
I look up the highest speed with the lowest pressure, to find my starting powder.
I think the lower pressure spike and longer bbl time helps with the boolit speed.....Buck
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