I can see the slower powders really needing a good crimp or
there will be large extreme spreads as the bullets unseat inconsistently, causing internal volume and pressure changes shot to shot.
I went up to about 920fps with the 290gr K bullet using 11grs of milsurp WC820(f) powder. ES was 10fos, and SD was 3.5. Worked well!
Complete thread:
- Took the Achilles to the Range This Morning -
JimT,
2024-07-16, 14:20
![[*]](themes/default/images/complete_thread.png "Open whole thread")
- Took the Achilles to the Range This Morning -
Paul,
2024-07-16, 15:01
- I am going back and forth between the Unique and Bullseye -
JimT,
2024-07-16, 15:03
- Since the 480A has almost the same internal volume -
JohnKDM,
2024-07-16, 17:29
- Yes. I try to get a good crimp always. And it is easier - JimT, 2024-07-16, 17:34
- Since the 480A has almost the same internal volume -
JohnKDM,
2024-07-16, 17:29
- I am going back and forth between the Unique and Bullseye -
JimT,
2024-07-16, 15:03
- I was there the day that .480 came off the truck -
A K Church,
2024-07-17, 18:12
- Yes ... it was a cheap Uberti .. - JimT, 2024-07-17, 19:04
- This article showed up in my inbox today -
JohnKDM,
2024-07-17, 19:32
- With the Achilles I have found Black Powder to be GREAT! -
JimT,
2024-07-17, 20:33
- I can see the slower powders really needing a good crimp or - JohnKDM, 2024-07-17, 21:35
- With the Achilles I have found Black Powder to be GREAT! -
JimT,
2024-07-17, 20:33
- Huffaker hollow-base - AaronB, 2024-08-20, 09:46
- Took the Achilles to the Range This Morning -
Paul,
2024-07-16, 15:01