Anyone knows which powder is used in PMC 357Magnum?

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VinnyQC

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I bought a case of PMC 357magnum a long time ago (was the cheapest way to get good brass back then), and just shot a box yesterday, and they're awesome accuracy wise. Better than reloads I make, and MUCH better than any other commercial stuff I've tried. I guess they just go along well with my revolver, because I don't see anything special about them other than being very very accurate in my particular revolver.

They're not as hot as my usual H110 reloads. Anyone has any idea which powder they use? Or has someone loaded 357 to something that feels/shoots similar to them?

I'm referring to these: https://www.canadaammo.com/product/detail/357-mag-158gr-jsp-variation
 
I doubt any ammunition manufacturers will tell you what powders they are using, and most of what they use are probably not available to reloaders anyway.

Most likely they are formulating a blend to give them a particular pressure for whatever weight projectile they want to use.
 
How about cutting back on the powder in your reloads if you don't like 'em snappy? Do some load testing and find a powder weight to bullet weight that works in your pistol.

If you want something a little milder, try Unique, CFE Pistol or TightGroup.
 
It would NOT be a canister grade powder. It probably isn't a powder available in a canister grade.

But, the main thing is you now now that a different load than your current handload will shoot better.

You say you use H110. This a good powder for MAx loads, but not so good for milder loads.

You can buy Campro 158SWC bullets quite cheaply. A powder that will load MAX and down to about 75% power, with excellent accuracy is 2400. It meters well, too.

Try loading 13.0 to 15.0 in 0.5 gr increments. Say 12 of each.

I just ran this test myself this morning in 8 different revolvers and 14.5 seemed to be the best for accuracy. Big flash, too....
 
I've had good luck with HS6 with a firm crimp. Its good mid range load and burn pretty clean as long as the crimp is good.
 
^^

Yes. HS6 tends to be hard to ignite when it is not a full case, compressed load (as it is in a shotgun - it is a shotgun powder)..

A crimp helps. Anyone using it should also try it with magnum primers. I have found that in 38Spl it makes a huge improvement.
 
I like the PMC 357mag as well. I've also been using the brass for my reloads and it's been quite nice.
If you have some Titegroup on hand, 5.4gr has been working nicely for me. It's a moderate range load that gives good accuracy out of my 6" S&W.
1.610" is what I ended up with after roll crimping in to the cannelure of a 158gr CamPro Plated Flat Nose. CCI 550 Primers
 
Thanks everyone.
The round felt like the powder was faster than H110 but slower than titegroup. Don't think it was 2400 either. No fireball, no long "WWWHHHOOOOCCCHHHH!!!", nothing typical of those slow magnum powders.

I understand I might never be able to get exactly the same thing. Was just wondering if anyone had some success with a load that would resemble it.

I'll try HS6 I think. It's somewhere between H110 and TG, so it might fit the bill. I might try Unique after that if I can get my hands on some.
 
My go to powder for jacketed bullets is Win 296 about most accurate and fast I have found
 
VinnyQC said:
Thanks everyone.
The round felt like the powder was faster than H110 but slower than titegroup. Don't think it was 2400 either. No fireball, no long "WWWHHHOOOOCCCHHHH!!!", nothing typical of those slow magnum powders.

I understand I might never be able to get exactly the same thing. Was just wondering if anyone had some success with a load that would resemble it.

I'll try HS6 I think. It's somewhere between H110 and TG, so it might fit the bill. I might try Unique after that if I can get my hands on some.
Click to expand...
ypu can have a look at the powder and get a general idea, too.
 
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