Powder Measure or Scale for hunting loads?

[Catfish]

I have been loading on a 550 Dillon since the 1980`s. When I started I would check every 10 th. load. Over time it went to every 50 th. and now to set and forget. I have loaded over 5,000 rounds of the same load without changeing anything. That is about the max. I can go without cleaning bullet lube from the seating die when useing cast bullets. I do check powder drop if I switch lot`s of powder. I also only use Ball powders as I have never seen a powder measure that would drop charges consistantly enough to suit me.
Standard Devation has already been mentioned and is something that you should keep an eye on if you have a cronograph. That said you should not try to live by it for normal hunting loads or loads for under 400 yrds. I have seen some loads that had excellant SD`s shoot like crap and loads with a SD of 50 or 60 be the most accurate load for a given gun. Once you get to 500 yrds the SD becomes more critical and the farther put you shoot the more critical it gets because of vertical stringing.