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HiBC · October 31, 2010, 01:46 PM

The 45-70 was designed for black powder.The case is sized appropriately for BP and the strength of rifles of the day.
If you are loading Black Powder at some time,you must fill the case all the way.even give it some compression.No air gap in the case!

Smokeless is a whole other ball game.

There are some strong rifles like the Ruger #1 that will allow you to use your case capacity,but older BP rifle designs present a handloading challenge:Selecting a powder that can work well at low pressures and provide sufficient bulk to work out well.

October 31, 2010, 01:46 PM	#3
HiBC Senior Member Join Date: November 13, 2006 Posts: 8,350	The 45-70 was designed for black powder.The case is sized appropriately for BP and the strength of rifles of the day. If you are loading Black Powder at some time,you must fill the case all the way.even give it some compression.No air gap in the case! Smokeless is a whole other ball game. There are some strong rifles like the Ruger #1 that will allow you to use your case capacity,but older BP rifle designs present a handloading challenge:Selecting a powder that can work well at low pressures and provide sufficient bulk to work out well.