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I've tried both ways, and IMO, pre-twisting stranded wire has a much higher pull out rate than not pre-twisting. (I always hold the wirenut in one hand and give a tug on each individual conductor after installing the wirenut to check for a loose connection that will allow a conductor to be pulled out).

I just about always pre-twist solid to solid, but not solid to stranded nor stranded to stranded.
 
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I have found that the old style Ideal 73, 74 and 76 wirenuts seem to make the most durable connections.
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methinks all the wires entering the nut of equal length should be a strong consideration.....~CS~
Absolutely! If you don't get them about perfect (stranded wire), one conductor gets pulled into the wirenut while the other gets pushed out.
 
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