300 MP

[44-40 Willy]

Has anyone tried Alliant 300 MP in a 357 rifle? I'm wondering how it would work in my 1892.

I asked at another reloading forum and the only response was to stick with 2400 as 300 MP is a fairly new powder and everyone should stick with tried and true powders.

[Pb2au]

Well, seeing as I have never heard of this powder yet, curiosity got the better of me so I went to the website and discovered this;
http://www.alliantpowder.com/reloaders/ ... rtridge=28

Might be a decent place to start. I figure if they are publishing the data on the interwebz, it must be pretty well lawyered up.

What projectile were you considering using?

[44-40 Willy]

If I can find some more Winchester Silvertip 145gr JHPs, that would be my first choice. 158gr Speer Gold Dot would be my second.

[donhuff]

willy,

I have used up about a 1/2 pound of a can of 300mp so far. I got it cause I could not find 110/296, and from everthing I can find to read about it, it's almost a direct substitute. It takes a little more of the 300 to get the same speeds though. I have only used it in 44 mag for some sonic boom loads with jacketed bullets. I use unique and 800x for the majority of my shooting. It should do fine in a 357M.

DonHuff

[44-40 Willy]

Thanks Don!

Is it a ball powder like H110? My Lee Perfect Powder Measure seems to want to leak H110 from the drum seams.

[donhuff]

Yes.
Some say it is even smaller than 110 but it looks real close to me. It also seems to be more dense so it might actually be littler.

[donhuff]

I set wy powder measure to throw 20.0 of 296, and it threw 20.15----20.2 of the 300mp.

it "LOOKS" identical to me.

[donhuff]

Well, did you try some?

[44-40 Willy]

Have to find it first.

[donhuff]

OOPS sorry, i thought that you had found it while looking for 110/296.

That's all I can find around here, cause nobody knows what it is.