applefish123
Member
- Joined
- Nov 11, 2020
- Messages
- 21
Does anyone know any trapdoor safe loads with Unique? And what is the maximum safe PSI for these originals?
In my old Lyman 44 they list:
Quickload is telling me that the pressures for the old Lyman 44 loads run around 25,000 psi. And if you look at the hodgdon data center online today, they'll list a bunch of jacketed loads running around 25,000-27,000 psi for the trapdoor. And the cast loads run around 16,000-22,000 psi.
However my modern Lyman 48 manual doesn't show any load going above 18,000 psi in the trapdoor; they write: "Overzealous reloaders have destroyed more than one Trapdoor through high-pressure loads. The following data is held to a pressure level of 18,000 CUP for use in the Model 1 873 Trapdoor. It is also suitable for Remington Rolling Blocks, Sharps Rifles and replicas of any of these rifles as well as the Harrington & Richardson Trapdoor." Lee also follows the 18,000 psi limit for their trapdoor loads.
So who is right about the maximum trapdoor safe load, SAAMI, CIP, and Hodgdon's Reloading Center at ~28,000 psi, or Lyman and Lee at 18,000 CUP?
In my old Lyman 44 they list:
- For 292 gr cast, 18gr (1497 fps) to 20 gr (1689 fps)
- For 385 gr cast, 14gr (1244 fps) to 17 gr (1408 fps)
- For 482 gr cast, 13gr (1112 fps) to 16 gr( 1242)
Quickload is telling me that the pressures for the old Lyman 44 loads run around 25,000 psi. And if you look at the hodgdon data center online today, they'll list a bunch of jacketed loads running around 25,000-27,000 psi for the trapdoor. And the cast loads run around 16,000-22,000 psi.
However my modern Lyman 48 manual doesn't show any load going above 18,000 psi in the trapdoor; they write: "Overzealous reloaders have destroyed more than one Trapdoor through high-pressure loads. The following data is held to a pressure level of 18,000 CUP for use in the Model 1 873 Trapdoor. It is also suitable for Remington Rolling Blocks, Sharps Rifles and replicas of any of these rifles as well as the Harrington & Richardson Trapdoor." Lee also follows the 18,000 psi limit for their trapdoor loads.
So who is right about the maximum trapdoor safe load, SAAMI, CIP, and Hodgdon's Reloading Center at ~28,000 psi, or Lyman and Lee at 18,000 CUP?