158 LSWC, Mag cases, no leading


February 20, 2012, 04:12 PM
I have a 5.5 inch 586 and a Rossi M92 and I want to have an accurate lead bullet load I can use in both. I looked over the old posts and it looks like 6 to 6.5 grains of Unique will be a good load. Has anybody had leading problems in either of these guns? Will magnum primers be required for best accuracey?

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February 20, 2012, 04:21 PM
Lots of smoke but no need for magnum primers. Pretty accurate in
my 66. 6.2 gr very good in 2 1/2 mSmith.

February 20, 2012, 04:23 PM
No, do not use Mag primers with Unique.

They are only needed for ball powder like H-110/W-296.

Nobody can tell you if your guns will lead or not.

It depends on the smoothness & size of the bores, the size of the bullets, the alloy mix used to cast them, and type of bullet lube used on them.

The only way to answer the question is to try it.


February 20, 2012, 05:14 PM
I am guessing the load will produce about 1100 fps, I would start at the lower load if some thought that speed would leave lead.

February 20, 2012, 05:55 PM
This is just my own experience with regards to leading in my 686-3.

I used to buy commercial hard cast (I only assume they are really hard since I do not have a hardness tester) 158 grain LSWC. I loaded them over 3.7 grains 700X, which is a "regular" 38 special load. Definitely had to scrub my bore after two hundred rounds.

In the last 3 years, I have taken up casting using Wheelweights and Lee 158 grain SWC and RN TL molds, among other calibers. Lube, size them to .357, re-lube with Lee Alox or X-Lox. Loaded these bullets in 38 special cases, over 4.3 grains (lately 4.6 grains) 700X, which are in the +P or +P+ range. I have no leading or very minimal leading even after 500 rounds. The 4.3 grain loads have been chrono'd at 1,000 fps average out of my GP100 6 inch barrel.

With the latter loads, my GP100 does not show lead at all, if any.

February 21, 2012, 11:01 AM
6g Unique with 158g LRNFP in 357 mag works well for me in my revolvers and Marlin 1894. Gives me about 1100 fps out of a 6" bbl

As RC said, do not use Magnum primers with Unique

Jeff H
February 21, 2012, 12:29 PM
I use 13.5 gr of 2400 and get no leading in any of my revolvers or Rossi 92. I did some testing with my carbine and found that I didn't have very good accuracy loading them any hotter. I do load that same bullet in 38spl cases to 38spl velocities and don't get any leading. Correct bullet fit is important.

February 21, 2012, 12:42 PM
Disclamer- this is what I used, i advise to consult your manual. I've uses 14.5 grains 2400 behind my 158swc for my go-to magnum load. I've found unique is okay but needs to be loaded hot to avoid the smoke. I've used 6.5 grains behind lswc as well as 7.0 and they were pretty mild magnums. 6.5 grains of bullseye had some pop as well and did not lead up the guns either. Good luck.

February 21, 2012, 12:44 PM
Fit is the key to leading free shooting. Measure the barrel and cylinder throats and use a properly fittes (sized) bullet. For my M92, with a .431"-.432" groove diameter, I shoot bullets of .432"-.433" (cause I don't have a sizer or mold that will give me any larger). For my revolvers, I size the bullet to the same size as the cylinder throats (.431" for my Ruger and Dan Wesson) which will be about .002" larger than the slugged dimension for the groove diameter. "Hard cast" is a misnomer as it can mean anything cast, rather than swaged. Size the bullet (or purchase sized bullets) to fit your gun and use "normal" powders and you prolly won't have leading probs...

February 21, 2012, 03:57 PM
Thanks for the good info. I will be trying the Unique and Bullseye loads first. I also reload 45ACP and those powders work well for me.

February 22, 2012, 01:00 AM
Don't expect to generate the velocity you see in the load data. It's always less in real life.

What bullet are you using and how hard is it?

February 22, 2012, 05:19 AM
More information on cause of leading, prevention and removal - http://www.lasc.us/Fryxell_Book_Chapter_7_Leading.htm

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