Load data for Plated 44 & 357

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ArtP

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I have Berry's 240gr .429's and 125gr .357's coming soon. I've loaded a lot of Berry's in 9mm for target/plinking, I've only used full house or lead in 44/357. These would be launched from a GP100, Ruger SBH and Marlin 1894.

I know I can use Unique, but I have only 1 pound left, while I have about four pounds of Power Pistol.

Anyone have load data for Power Pistol and the weights mentioned above? Alliant data is too fast for these plated bullets, especially from the rifle. My Hornady, Speer and Lyman manuals don't have it.

Since these arms are modern and strong, can I safely use 44 spl and 38 spl data in the magnum cases?
 
If you are trying to duplicate the burn characteristics and Special velocities in a Magnum case, I would increase the Special load by 10%, since the Magnum case is (very roughly) 10% longer. So, for Power Pistol and 125 gr .38 +P at 6.8 grains, I'd feel pretty confident going with 7.5 grains in a Magnum case. You might want to work up from the .38 charge in 0.2 or 0.3 grain steps to see if the bullets find an accuracy sweet spot, but I can't believe you'll either stick a bullet or cause your GP100 to break a sweat with that range of loading. Pressure might be a bit above .38 +P range, but still way below typical .357 pressures and velocities.

It would be interesting if someone would run this through Quickload to see what the silicon thaumaturge says.
 
Berry's website says:

We do not research or publish the load data, but you can use any published load data for a jacketed or lead bullet as long as it is the same weight bullet. Any of the load data books or the powder manufacturers’ website should have that information for you, as long as you keep them under 1250 fps for our standard bullet or 1500fps for the bullets designated as TP (thick plate).

If a COL or OAL is needed please email [email protected] for further information.

We recommend very little crimp on the bullet, just enough to put pressure against the bullet without denting or deforming the plating. If you were to pull the bullet out of a case with the proper crimp you would find no more than a scratch on the surface of the plating. If you are denting or deforming the bullet your accuracy will suffer and the bullet may start to tumble before it hits the target.
 
Anyone have load data for Power Pistol and the weights mentioned above? Alliant data is too fast for these plated bullets, especially from the rifle. My Hornady, Speer and Lyman manuals don't have it.


Me thinks you have answered your own question. If you can't find a published load for the velocity you want or the powder/bullet combo you have , odds are there's a reason.
 
I generally load plated some where between lead and jacketed.
I have had no issues using .38 special loads in .357 mag cases.
As stated earlier you may need a bit more powder to reach the same velocity as you would with the .38 case. I load most of my plated for the .357 somewhere between 1100 and 1200 with 125s, sometimes even lighter--aroud 1000.
 
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