What's your target weight Paul?
Also, do the lube grooves have a use on an air powered device? If not, it should be pretty straightforward to build an adjustable mold. Round nose milling cutter and a piece of 1/4" drill rod would get you a long ways down that road.....(this from a fella who hasn't cut a chip for over 35 years...)
Complete thread:
- Anyone have a 257-420 mold laying around gathering rust? - 
Paul, 
2012-07-26, 09:29 
- Not quite.... - Hoot, 2012-07-26, 09:49
 - Anyone have a 257-420 mold laying around gathering rust? - 
Wildcat, 
2012-07-26, 10:36
- Thanks, Hoot and Wildcat... - 
Paul, 
2012-07-26, 11:18
- That Lee mould was picked up on their surplus page. - Wildcat, 2012-07-26, 13:12
 - What's your target weight Paul? - 
Hoot, 
2012-07-26, 14:30
- Hoot, I'm not quite sure yet.  Still reading, digging, - 
Paul, 
2012-07-26, 14:53
- OK. The slugs I offered are for the .25ACP - 
Hoot, 
2012-07-28, 08:16
- Somehow I had not caught that detail... - Paul, 2012-07-28, 11:53
 
 
 - OK. The slugs I offered are for the .25ACP - 
Hoot, 
2012-07-28, 08:16
 - OK. Some guys are getting great results with - Paul, 2012-07-30, 14:16
 
 - Hoot, I'm not quite sure yet.  Still reading, digging, - 
Paul, 
2012-07-26, 14:53
 
 
 - Thanks, Hoot and Wildcat... - 
Paul, 
2012-07-26, 11:18
 - I have a 257-312 I'm not really using - 
woody, 
2012-07-26, 13:13
- Thanks, Woody. - 
Paul, 
2012-07-26, 14:55
- Thought it would be but wanted to offer - woody, 2012-07-26, 20:39
 
 
 - Thanks, Woody. - 
Paul, 
2012-07-26, 14:55
 - Why? - 
Byron, 
2012-07-28, 11:08
- Why? Well, geography, politics, personal inclination... - 
Paul, 
2012-07-28, 11:50
- Probably won't work anyway...... - 
Byron, 
2012-07-28, 17:59
- There is such a thing as an - 
Paul, 
2012-07-28, 18:11
- Sounds like a lot of work... - 
Byron, 
2012-07-29, 14:04
- Sounds like a lot of work... - Paul, 2012-07-29, 17:52
 
 
 - Sounds like a lot of work... - 
Byron, 
2012-07-29, 14:04
 
 - There is such a thing as an - 
Paul, 
2012-07-28, 18:11
 
 - Probably won't work anyway...... - 
Byron, 
2012-07-28, 17:59
 
 - Why? Well, geography, politics, personal inclination... - 
Paul, 
2012-07-28, 11:50