Quote:
Originally Posted by mscampbell2734
Grain weight refers to BOTH.
The general rule of thumb is a heavier bullet requires a lighter powder charge.
The reason is a heavier bullet results in both more friction with the barrel, the heavier bullet is physically longer, hence more contact and friction, and the heavier bullet has greater inertia. Both result in more pressure, meaning a lower powder charge to stay within safe limits.
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Well , maybe yes , maybe no. That's if you ASSuME that the same powder is being used.
But if a handloader is using , say , HP-38 , yes , a heavier bullet would generally call for a lighter powder charge , due to the burning characteristics of smokeless powder.
But since we never know just what powder the factories use in which loads , , ,