I've started loading rifle on a Lee Classic Turret press and have used the RCBS powder checker in one of the stations. The whole setup was very nice, a good compromise between a single stage press and a "full" progressive. I've decided to set up a whole lot more of the turrets for different calibres each with their own preset powder checker. I am happy with the RCBS unit but having never seen the Hornady unit I wonder how it compares. I gather that it was developed by Vapodog so he might chime in here. Does it give a good indication of under/overcharge for rifle size loads. Thanks

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I gather that it was developed by Vapodog

There is a rumor to that effect....

The Hornady powder cop will visually show a difference in a few grains of powder but you must look at it for every load.....it's not electronic and must be watched.
It's developed requirement was to easily detect 2.5 grains of bullseye in a 38 special case and it does that easily.

I have an electronic device in my Dillon that buzzes when the powder hopper is low and I really like that as it warns me to install new powder. You don't have to look at it all the time as you do the powder cop.

You set the powder cop to show the O-ring at a correct powder setting and if the next case has more or less it will vary the height of the O-ring quite visibly.

More often than not the error will be a NON charge and not a low one....and the cop will show it immediately.....but you must look at it!

I don't recall how the RCBS unit works.

I designed a die with a buzzer but it was deemed too expensive....

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Does it give a good indication of under/overcharge for rifle size loads

YES...easily~!

Thanks. The RCBS works in a similar fashion. There is a central rod which gauges the powder level by moving up and down representing the height of the powder column but unlike the Hornady which I presumes indexes or refers to the top of the die body, the RCBS indexes against an offset rod. It's not electronic, you have to watch it and its quite easy to do, its just that I thought I would give the Hornady version a try if it works in a similar fashion.

This setup is worth a look.
http://quick-measure.com/progadapter.htm