I currently have the Hornady bushings retrofit to my Rock Chucker single stage (easy, unscrew the threaded bushing on the rockchucker, screw in the bushing convertor.
This allows you to insert, then twist a die (that has bee attached to a bushing) into the press instead of unthreading the die all the way and then threading the new one in all the way.
You'd think it was trivial, having to screw in and out the dies, but trust me, the bushings make that task so so much more efficient, and your depth settings are set against the bushing so they don't change.
My only complaint against the Hornady bushings is that the "ring" part is circular with very slight flats on two opposing sides only.
So since they aren't expensive and since I ordered a Lee APP press that incorporates their own bushing system, I ordered a conversion for the Rock Chucker to possibly replace the Hornady bushings.
One thing I like is that the Lee bushing is itself a lock ring. With the hornady, you need to still use a lock separate lock ring. The Lee bushing has a tightening screw which snugs the die in a bear hug. Also, the lee rings now have this really bumpy grip type of knurling and a small half circle wrench for them if you want. This is great, I wish all lock rings were like this as on a progressive press, it's hard to get any wrench on the lock rings to snug them down. Also with the hornady lock rings (normal, not bushing) the flats are again only on two sides, and rcbs lock rings push a screw up against the die threads which I think may damage them.
Anyway, I just got the stuff today and thought I'd ask other people if they have any preference for one system or the other. In principle I'm liking the Lees, but I've not yet tried them out for real yet.
This allows you to insert, then twist a die (that has bee attached to a bushing) into the press instead of unthreading the die all the way and then threading the new one in all the way.
You'd think it was trivial, having to screw in and out the dies, but trust me, the bushings make that task so so much more efficient, and your depth settings are set against the bushing so they don't change.
My only complaint against the Hornady bushings is that the "ring" part is circular with very slight flats on two opposing sides only.
So since they aren't expensive and since I ordered a Lee APP press that incorporates their own bushing system, I ordered a conversion for the Rock Chucker to possibly replace the Hornady bushings.
One thing I like is that the Lee bushing is itself a lock ring. With the hornady, you need to still use a lock separate lock ring. The Lee bushing has a tightening screw which snugs the die in a bear hug. Also, the lee rings now have this really bumpy grip type of knurling and a small half circle wrench for them if you want. This is great, I wish all lock rings were like this as on a progressive press, it's hard to get any wrench on the lock rings to snug them down. Also with the hornady lock rings (normal, not bushing) the flats are again only on two sides, and rcbs lock rings push a screw up against the die threads which I think may damage them.
Anyway, I just got the stuff today and thought I'd ask other people if they have any preference for one system or the other. In principle I'm liking the Lees, but I've not yet tried them out for real yet.


Bob B. 
I'm paying < $4/each for the Hornady ones...I'm buying in packages of 10
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