Reeder Custom Guns - That's not too scary, considering true Magnum CUP

WB
That's not too scary, considering true Magnum CUP
Tuesday, October 28, 2025, 09:57

comparative numbers. The .357, .44, .454 CUP data we had before it went to PSI were much higher. Even the humble .22 WMR has shockingly higher CUP. But the cylinder thickness at the bolt cut is pretty whimpy on some .45 Colts.

An old 1960's SA copy is a little iffy, but a Ruger Blackhawk or much less a Redhawk is no worry for me. The S&W M25 needs a little more gentle consideration.

Most of those loads are way more that what I care for on a daily or sustained basis.

.45 Colt Pressure Data - Jim Taylor, 2025-10-28, 06:13
- Thanks Jim! I’ve recently been toying with - drdougrx, 2025-10-29, 04:56
  - I think I had almost a compressed charge of 1680 - WB, 2025-10-29, 13:44
- That's not too scary, considering true Magnum CUP - WB, 2025-10-28, 09:57
  - These were all Ruger Blackhawk loads. - Jim Taylor, 2025-10-28, 10:12
    - I thought that looked like a .45/70 bullet, resized. (nm) - WB, 2025-10-28, 13:50
      - It's the old Lyman .45-90 bullet. (nm) - Jim Taylor, 2025-10-28, 14:57
    - That is a very good idea. I used to load Keith's - WB, 2025-10-28, 12:16