Thread: newbie help
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Old May 5, 2013, 03:17 PM   #2
Misssissippi Dave
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Join Date: December 5, 2009
Posts: 1,411
The difference in the amount of powder can easily be the result of a different bullet with the same weight or how deep you seat the bullet. How hard the bullet is can also be a factor. There normally is a big difference in the amount of powder used between lead/plated and jacketed bullets. Some references are more on the cautious side as well.

Think of it this way when you see the need for more powder with a lighter bullet. The time a bullet is in the barrel while gas is expanding is a shorter time than it is for a heavier bullet. You need a little more power to create gas in a shorter time. You will see this more with certain types of powder with a give burn rate compared to others. There seems to be certain exception to many general observations.

A cronograph is often used by reloaders to determine how fast a bullet is going at a given distance. They can also see how much variation there is from one test round to the next. You can also see when a powder is spiking by measuring the speed. They can be used for a lot more but this seems to be the things referenced most often. It seems this is one of the best tools available to develope loads. When you don't know just what published bullet you can find compares the best to the bullet you are wanting to load, a cronograph is quite useful. It is something to think about getting one day.
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