I just got an order in the other night, and started matching P and N transistors right off the bat... (13 matches out of 20 PNP's and 30 NPN's isn't bad!).
The DMM I use for tranny gain is a cheapie from HF. I started with an empty ice cube tray, threw any trans back in the bag that measured under 170, and started sorting. When I went back and double-checked the pairs, they all started measuring 5-10 higher than when I started! BUT, they all increased together. I figured out it was the light I had on them... when I started, they had been in a bag in the basement. After about half hour under the light, they all warmed up pretty good (about 7 deg F air temp from dark basement to the living room).
So I resorted a couple, and found some more matches. I went through after I was all done and they were all still within .1-.2% that I had originally matched them at (200 and 201 would be .1% match, right?).
Anyways, I'm just matching them so when I use 10k, PNP, NPN to ground, and bases tied together, I get the .6V diode drop at the Collector of the NPN. With just a bit of double-checking, the cheapie DMM I use seems to be REALLY consistent for my purposes.