Smokeless powder is weird.
Yes , there is a relation between case volume , load density* , and pressure.
*Load density is the proportion of powder to case volume with bullet seated.
BUT , higher pressure does NOT always equal higher velocity.
Powder burn rates is another factor.
Different powders burn at different rates.
Some do not like being compressed.
Some do not burn completely when not slightly compressed.
*Some data sources list load density.
*LD over 100% = compressed load.
So assuming an equal amount of powder with the same bullet is safe in .357 mag cases just because it's safe in .38 Special , or vice-versa , is not a given. It can cause a low powered round , or it can be over pressure.
STICK TO THE DATA PUBLISHED IN MANUALS.
Last edited by mkk41; 01-05-2013 at 08:20 AM.
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