Luggernut: when you get to the above link, click the link called "technical specifications and use". It explains how it works.
December 1, 2006, 01:33 PM
Snuffy- COP doesn't mean anything specific (other than another name for a LEO), it's just what Hornady calls their powder checker. I'm sure RCBS, etc. make them as well... I'm just curious as to how specifically they work. :)
December 1, 2006, 01:37 PM
Well... I found this... I'm just not so sure how the stem doesn't get depressed into the powder and/or cause overflow in cases that are pretty full with powder...
This device resembles a standard reloading die with a moveable stem in the center. It is threaded into a station in a progressive press at a point just after the case is charged with powder.
When the charged case is brought up into the Powder Cop during the next operation of the press, the center stem in the Powder Cop contacts the powder charge in the case.
After adjustment of the Powder Cop, when a correct powder charge is present in the case, a white O-ring will be visible on the Powder Cop center stem and the O-ring will be even with the top surface of the Powder Cop body.
If there is no powder charge in the case, the stem will not rise.
If there is an overcharge of powder, the stem will lift the O-ring well above the surface of the Powder Cop.
December 1, 2006, 02:30 PM
It's not an acronym then! COP as in police!
Dunno how the Hornady die does it, but with the dillon powder check die, there's 3 different sized brass "feet" that rest on top of the powder column. You select the one that easily clears the inside of the neck of whatever case you're loading. I suppose there's a powder out there that is fluffy enough to allow the "foot" to penetrate the powder column, but normal powder is pretty substantial when in a charged case.
With the dillon die it is hooked up to an alarm that is activated by the shell plate. It comes to rest in an indent or small area on the shaft the foot is attached to. You adjust the height of the indent to coincide with the desired powder level. If more or less powder is present, the alarm hits the full sized shaft and a high pitched buzzer sounds.
The Hornady die would require you to look at it each time you cycle the press. Just an extra something to watch out for, I suppose it's better than nothing!:(
December 1, 2006, 02:40 PM
Thank you snuffy!!
December 1, 2006, 04:04 PM
RCBS makes a Lock-Out die with similar operation that physically stops the operation if the powder charge is incorrect. I find the dies that require looking at to be useless for my purposes.
December 1, 2006, 04:12 PM
Works about like my homemade one. If powders there the stem sticks up.
December 2, 2006, 02:48 AM
I use an RCBS powder check (not lockout) die and find it very useful. I prefer the rcbs over the hornady check die. Both have a rod in the center that moves, but the rcbs has another fixed rod on top of the die with an adjustable contrasting ring for a level marker. On the LNL-AP, I use the check die in the 3rd station which is on the front side of the press. It's easy to see the motion of the check die rod.
If you enjoyed reading about "How exactly do Power COP dies work?" here in TheHighRoad.org archive, you'll LOVE our community. Come join TheHighRoad.org today for the full version!