Power Pro 300-MP Rant

Beemer-mark · Apr 10, 2011

Generally I use Alliant 2400 to load 357 magnum but my dealer can't get it, all he gets is Alliant Power Pro™ 300-MPfor Magnum Pistol. It's the worse **** I've ever used. Next to no load date. Using Alliant's single recipe (no min, no max) it pretty much duplicates 2400. OK I can live with that.
It has the consistency of baby powder. And like baby powder it just "fluffs" all over the place. Tried it in my square D and what a mess. Ends up all over everything and sticks like super glue. Got between the shell plate and press surface and turned into some kind of tough plastic sheet. Had to dissasemble everything and scrubbed it using a brush and brake cleaner.
Tried it in my RCBS single stage press, not much better results. Wants to bridge in the powder dispenser, sticks to the loading pan and blows all over (even when in the brass).

Loaded half a pound, going to burn the other half.

Rule3 · Apr 10, 2011

Sorry to hear that. Perhaps write them a letter. They may be nice and give you a coupon or something. I looked at some of the load data for the Gold Dots. Wow!, it does have some velocity if you can get it in the case. Guess I will not be trying that powder.

David Sinko · Apr 10, 2011

How long has this stuff been on the market? I've never heard of it.

Dave Sinko

Jellybean · Apr 10, 2011

Beemer-mark said:
Next to no load date. Using Alliant's single recipe (no min, no max)...

I've never heard of it either so I can't give a lot of help, although I can tell you Alliant usually lists their max. load in their data sources and tell you to reduce by 10% for a start load and work your way up.

David Sinko · Apr 10, 2011

If I can use this powder to get an honest 1050 FPS with 158 gr. bullets in my 2" Model 64 with no high pressure or flash (now where have we seen those ballistics?) I'd buy it.

Dave Sinko

Buckey08 · Apr 10, 2011

Used this powder with 158 gr XTP's Saturday mourning in my 6" 686 and shot the best group I've ever shot.FPS and SD were great, I will admit the powder is on the fine side but doable in a old lyman #55 powder measure. Had to work up slow and ended up short of Alliant suggested loads. Will begin to prep 200 once fired cases for my new favorite load.From what I saw it's worth the hassle.

Buckey08 · Apr 10, 2011

From what I've heard from a person not far from where I live this new powder works great in a .357 Max. I'll be testing this later this week.

Beemer-mark · Apr 10, 2011

I get 1180 fps with 16.6 gn 300 MP, 1171 with 14.0 gn of 2400. 158 gn LRN cast with #2 alloy in my model 28. No difference in accuracy.

Guess I'll have to bite the bullet and pay hazmat shipping fees again.

parabarbarian · Apr 10, 2011

Thanks for the information. I'e been looking that the velocity claims and considering 300 MP for 357 carbine loads. I use 2400 under a Hornady XTP now and it perform well but 300-MP seems almost magical.

bearcat2 · Jul 7, 2013

I realize this is an old thread, but I just got a 357 and was looking for load data for the powders I have in my bench. I had previously loaded for my moms 357 using hi-skor 700-x, but hated the powder (dirty, and didn't meter well in a progressive press) and used it all up without getting more. I have both 2400 and 300-MP, I have used both in 44 mag, but while my 218 Bee Imp absolutely loves 2400 (sub 1/4 moa groups) my 44 hates it. I like the powder, but my 44 absolutely will NOT group with it. On the other hand it loves 300-MP, to the tune of 1 1/2 to 2" groups at 25 yards, out of 4" Taurus Ultralite. I agree 300-MP is messy, but I have found it to meter very well, in fact more consistent than any other powder I have ran through my Loadmaster press, high velocity (can't remember the numbers off-hand but slightly greater than 2400) clean burning, and with accuracy like that (twice as accurate as any other load in my 44) it is all I feed my 44. I just have to vacuum my press and bench when I am done loading.

Well I guess I'll just have to load up some of each and see what my 357 likes.

Nevada Ed · Jul 7, 2013

One of my hunting buddies on a hunting site used it in his 357 and he said that...................

Yes it does give high fps and it also gives..............

LOTS of FLASH & BOOM !!

Sort of like power pistol in the 38 spl.

It might be a love/hate powder ?

michaelnel · Feb 15, 2014

I loaded up some test rounds of this junk with 200gr Hornady XTPs and tested in my PC Stealth Hunter .44 magnum on my Ransom Rest. I loaded rounds at 27, 28, 29 grains. It almost overflows the .44 magnum case because it is so fluffy.

Worst performance by a firearm of all the testing we have done. Wild 6-10" fliers in most five shot groups. Blew unburned powder all over the bench. Lots of smoke and fire. Nasty stuff, I hope it will work well as fertilizer.

pickupman250 · Feb 18, 2014

I run this stuff in my .44 mag, 50 action express and 357 magnum. and I have had no trouble with it other than it is alittle messy. The chrono looks great, grouping is great and the flashy boom impresses all that watch.

ArchAngelCD · Feb 18, 2014

I don't know, Alliant Power Pro 300-MP is rumored to be the same powder as W296/H110 and if that's true I don't see how it can be all that bad. I have been using W296 for a long time for full power .357 Magnum ammo and I'm very happy with the results.

buck460XVR · Feb 18, 2014

ArchAngelCD said:
I don't know, Alliant Power Pro 300-MP is rumored to be the same powder as W296/H110 and if that's true I don't see how it can be all that bad.

I heard the same thing....even read it in a gun rag(don't remember which one...I think it was "Handguns"). Anytime one uses a fine powder that nearly fills the case, there will be issues with it "jumping" outta a case when using a progressive press that has movement when used.

Nevada Ed · Feb 18, 2014

Might be close to w296 and H110 but..............

Alliant data is calling for a f100 primer........
not a mag primer.

boatbum101 · Feb 22, 2014

With 2400 being unavailable I was curious about this powder & AA#9 for both 357 & 41 mags myself . Plenty of data for AA#9 , but not much out there for 300MP .

michaelnel · Feb 22, 2014

I have great results from Alliant 2400, Vihtavuori N-105, and AA #9. I sure couldn't make that 300MP work though. I did not use mag primers, I used CCI300.

Buckey08 · Feb 22, 2014

I have had nothing but good luck with this powder in both .357 to .44 mag.I use a single stage press and a Lyman #55 powder measure with this powder and am having a real hard time with some of the horror stories I'm hearing, kinda hard to believe. My main hobby for the past 48 years has been reloading and the shooting sports so when I hear about some one having a reloading problem or a powder problem I tend to listen real carefully!

parabarbarian · Feb 23, 2014

ArchAngelCD said:
I don't know, Alliant Power Pro 300-MP is rumored to be the same powder as W296/H110 and if that's true I don't see how it can be all that bad. I have been using W296 for a long time for full power .357 Magnum ammo and I'm very happy with the results.

I seriously doubt that. I've loaded several hundred 357 rounds with it and shot them through revolvers and Marlins. Both powders produce similar velocities at the high end with a slight edge to 300MP. I didn't try to compare smaller charges because H-110 doesn't react well to reduced loads. They are similar in performance but not the same powder.

Power Pro 300-MP Rant

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