On my way home last night I stopped by one of the gun shops and checked to see if they had any 25ACP brass. The only thing they had was 18 peices of once fired so I bought those to have a refrence. I got out my loading info and found the 25's OD spec is .278", the brass I bought was .281". I guess I will need a full length sizing die to make it work or just buy new brass. This brings up a question, how much expansion of the brass do you guys getwhen used in the modified breach plugs?

I'm going to check a few more shops locally to see if any have the new brass in stock. I did go ahead and check the over all length of my extra BP with a 209 in it and found that I needed to drill just over .500 deep to put the 25 brass in the same place. I set up the drill press as Semisane described and modified the BP in less than 5 minutes. Now I just need brass to test it. It was a very easy modification using tools I already have for reloading (calipers) and in my shop (drill bitsand drill press).It could probably be done with a hand held drill but I have a drill press so I used that to keep things better aligned.

I will report back when I get some brass and some time to test it.