Reeder Custom Guns - .225 Winchester brass is the ticket.

Keith
.225 Winchester brass is the ticket.
Thursday, December 31, 2020, 12:27

I use these for a straight wall .40 caliber magnum (1.29" case length) in my 686/646. Works for 10mm auto rim, as well.

All you need to do is trim to length and ream the inside of the neck. I also expand the neck by 5 thou with a mandrel first, but it's not necessary.

The base diameter is already perfect and it conveniently has the ubiquitous .473" rim. So, if you want a bolt action, magazine fed carbine a new barrel is all you need.

Python 10mm - Ronnie P, 2020-12-30, 21:07
- Yes. I'm doing something similar - Keith, 2020-12-31, 12:35
- Get a 10mm GP100 and send it to Gary to slick up - Amede, 2020-12-31, 08:37
  - Had a 3 inch .38 Spcl GP-100 that - Ronnie P, 2020-12-31, 13:44
  - I bought the 5" Half Lug GP-100 10mm.... - Huey, 2020-12-31, 09:10
    - I almost went for one of those, instead picked up - Amede, 2020-12-31, 10:57
      - Darn near bought one today! Maybe Saturday! (nm) - Larryh, 2020-12-31, 18:05
        If its the 44 Spc dont hesitate, not sure - Amede, 2020-12-31, 18:59
      - Me too.....nice revolver (nm) - Woody, 2020-12-31, 12:34
    - I have a Custom GP100 6” in 10mm, worth it. (nm) - WB, 2020-12-31, 09:37
- ANYTHING IS POSSIBLE BUT SAFE?? (nm) - JT, 2020-12-30, 22:12
- I take it you are speaking of the late $1600 ones and not - WB, 2020-12-30, 21:37
  - Definitely one of the new ones - Ronnie P, 2020-12-30, 22:17
    - I made exactly six rounds of 10mm rimmed - WB, 2020-12-31, 09:47
      - .225 Winchester brass is the ticket. - Keith, 2020-12-31, 12:27
        Thanks! I’ll have to look into that! - WB, 2020-12-31, 14:44