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Old February 9, 2013, 03:37 PM   #2
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 10,206
Welcome to the forum.

A general rule of thumb for maximum or near maximum loads you've developed in a gun is to reduce the charge 5% when changing either case or primer, then work back up while watching for pressure signs. That said, it depends on the size of the charge. If it leaves a lot of empty space in the case under the bullet, then the difference in brass will have less effect than if the case is nearly full in one of the cases, which would mean it either leaves space or is compressed in the next. Also, pistol cases don't typically vary as much from brand to brand as some rifle cases like .300 WM or .308 Win do. If it doesn't fill the case and is not a maximum load, it can probably be substituted in just fine.
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