Lee breech lock pro \ Dillon 550 shell plates

[beechbum444]

Is it just me or does the shell plates for the 550 Dillon and Lee breech lock pro look interchangeable ???

[Drew P]

I wouldn’t put it past lee to do something brilliant like that.

[onelight]

OD on the Lee is 2.235 I don't have a Dillon shell plate to measure.
I have a friend with one but won't see him for the next few days.

[Daver7]

OD of a Dillion is 2.337 the holes that the spring loaded ball goes into are .2496 with approximately 1.000 center to center and the center hole is .5027

[onelight]

I'm measuring with a dial caliper so this will be close but not exact.
The index hole on the Lee .250
The center hole is threaded it is aprox. .445
center to center on 2 of the index holes is .880 across the center the index holes are 1.250 CC
It is .304 thick
I hope nobody makes or buys one off my measurements
Might be enough for go-no go

[Daver7]

Looks like it wouldn't work without modification.
the center hole could to be bored out to .502 or so.
Plate is .250
Index holes would be off .06, a larger chamfer on the index holes MIGHT take care of that.
Center to center of the dies measured about 2 inches.
Looks like it could be modified to work but I think it would be easier to start over and make from scratch.
Or just go ahead a buy one.
It was fun checking into it, but I'm an old Tool and Die maker so I'm easily entertained.

[beechbum444]

Just eyeballing then, they loook soooo close