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Old December 4, 2012, 01:11 PM   #13
RickB
Senior Member
 
Join Date: March 1, 2000
Location: Boise, ID
Posts: 8,516
I don't see how you can make the relationship of two cartridges clearer by drawing a comparison to other cartridges; someone who understands .38 Spl/.357 Mag, or .38 Auto/.38 Super, would also understand 5.56/.223.
If you need to get less technical, choose something that laypersons would understand, like gasoline octane, to illustrate how you can use one, but not the other. If your car requires 92 Octane, you can't use 87, but if your car will run on 87, it will run on 92.
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