Loading .357

[mugsie]

I need a little advice. I'm loading .357 rounds using a Speer manual (the latest version) which calls for 6.9 grains of Unique as a starting load for a 158 grain bullet. So far so good. Here's the problem - I'm using 158 grain RN Berry's plated bullet. The Speer manual calls for the 6.9 grains of Unique for the Speer bullets which are TMJ or Hollow points. The manual also calls for 6.0grains of Unique if using a 158 grain Lead SWC.

So, which is it? Do I go with the 6.9 grain starting load since the Berry's are plated? The Berry's are .357 diameter. The lead bulet mentioned in the manual has a .358 diameter. I hope I'm not confusing eveeryone, but the Berry's bullets I would think are the same as FMJ even if the plating isn't as think.

Any ideas guys? Again, it's a 158 grain RN Berry's plated bullet .357 diameter using Unique powder.

Thanks for the help....

 

[joneb]

I would start with the 6.0 grn load. What are you loading for ? If for a revolver, what is the cylinder throat dia. ? My Colt Trooper cylinders are .358 dia, my S&W's are .357 dia. I load accordingly.

 

[mc223]

I have been loading the Berrys and Raniers for a long time they should be loaded as the same weight lead bullet. The copper plating if fairly thin, and nothin inside but nice soft lead. I've juiced them up a bit for match type shooting, and ocasionaly gotten some barrel leading. I moly coat mine, cuts down on copper deposition and that nuisance leading.

 

[BluesBear]

Plated bullets are to considered as lead bullets. But be careful when crimping.

Jacketed bullets are a whole 'nother animal and have different data and results.

There will be vast differences in friction characteristcs between the two.
Be Safe! - Use the appropriate data.