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I've been burning H110 and WC296 for decades in my Magnum pistols . Has anyone any experience with Alliant 300 MP ?
 

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I treat MP300 like a slow lot of H110/296. In 357MAG for instance, it really begins to shine when the barrel length gets 10 inches and over. It is likely one of the best 357 Max/Max Carbine powders out there for the guy that shoots normal to heavy bullets. The guys that try turning a 357MAG into a 110/125 grain 357Swift probably aren't going to like it as well as the the H110/296 though. It seems to prefer a little weight in front of it.
 

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The numbers that Alliant gives in there loading data certainly are impressive.
"The numbers in your firearm may be different.", a statement you will likely never see in print :)
 

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Do not use this as data, this is what worked in my 357MAG toys.

16.2 grains MP-300 with a 180 grain wide flat nosed & gaschecked home cast bullet sparked by a Rem 6.5 rifle primer.
10" contender barrel = 1570 fps
20" Marlin Cowboy = 1720 fps
 

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16.2 grains MP-300 with a 180 grain wide flat nosed & gaschecked home cast bullet sparked by a Rem 6.5 rifle primer.
20" Marlin Cowboy = 1720 fps
That is INDEED a very good number.

Haven't seen a lb lately, but I'll keep an eye out. Might be just the ticket for my limited supply of 170gr Speer Deep Curls.
 

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That is INDEED a very good number.

Haven't seen a lb lately, but I'll keep an eye out. Might be just the ticket for my limited supply of 170gr Speer Deep Curls.
Just remember cast bullets run faster with less pressure when compared to jacketed bullets IN MOST GUNS. Start well below that and work up to it. Vhitvouri N-120 shares many of the same traits as MP300 in 357MAG/MAX, and the N120 burns a bit cleaner, but it is hard to find and more expensive. Both seem to appreciate a primer that is on the warm side of normal. I use 6.5Rems in the 357Mag and Rem 7.5's in the Max. Both them loads are MAX in MY GUNS, and I got there by systematically sneaking up on that charge.
 

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Just remember cast bullets run faster with less pressure when compared to jacketed bullets IN MOST GUNS. Start well below that and work up to it. .
I haven't looked at any of the actual load data for for MP 300, (as I don't have any). Are there any issues with low end loads, ala W296/H110? Or is it more like 2400'ish ??

The only issue I have with W296 is that it doesn't reduce with predictable results like 2400.
 

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I haven't looked at any of the actual load data for for MP 300, (as I don't have any). Are there any issues with low end loads, ala W296/H110? Or is it more like 2400'ish ??

The only issue I have with W296 is that it doesn't reduce with predictable results like 2400.
I would not reduce 300MP, it is happiest when going full steam or real close to full steam. FWIW, I have never been a fan of 2400 in the 357's personally. When going mid range with a 357 I find Herco to be much more cooperative in the ultimate accuracy department, but that is me. I do not shoot any of the copper clad heathen bullets though. I make my own cast bullets. Cannot remember the last time I shot a jacketed bullet in a 357 actually.
 

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Got it.
I have used 2400 and W296/H110 for almost 50 years. Handguns and carbines. Over time my general experience is that 2400 seems to do the best with lighter bullets with the .357/125gr and .44 Magnums/180gr. (Which I rarely use). My 77/357 seems to prefer 2400 over W296 for my large supply of Speer 158gr HP's, the ones sold in bulk boxes. Ya never know.

Most of the loads that go into my various magnum handguns, which get cast lead at a ratio of 100:1 to jacketed bullets, (maybe 1000:1), are fueled with Herco. I think Unique does a better job in my .380/9mm loads, it's cleaner, but Herco does a good job getting a good cast bullet to 1100-1200fps without leading, using way less powder than 2400.
 
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Yep, I do not shoot light bullets in the 357 or the 44 either for that matter. I shoot more 180 grainers in the 357MAG than all the rest of the weights combined. When I want that light weight range I grab the Buckeye Blackhawk 32-20/32H&R ;) Herco also shines in that fine piece of iron. SR4756 does a bit better for true full effort 32-20, but my supply of that is finite so I only use it for serious loads. Herco fills in the void when conserving my stash of 4756 though.
 

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I use MP 300 a lot and just use published data for 240 gr and up .44 mag and 158 gr. and up for.357. I use it along with H110 and 296 for like applications. Unique, Herco and 4227 are used sometimes for less powerful rounds.. Just a feeling, but I think 300-MP is a bit milder or, at least, less sharp than H110 and 296. But it's just a feeling.
 

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I know some people who have used it for their 410 loading when 296/H110 was not available. They like it fine, but have reported some metering issues in PW presses.
 

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Just a feeling, but I think 300-MP is a bit milder or, at least, less sharp than H110 and 296. But it's just a feeling.
I cannot tell one load at 1500fps, etc. from any other load at 1500fps. When you get a good heavy bullet going as fast as possible with W296, 2400, 4227, (and I suspect any other powder), recoil becomes distinctly greater. But I can't tell the difference. With 2400 in my magnum revolvers, I can back off a bit with acceptable accuracy, and slightly reduced loads recoil less, but they don't turn into a pussycat.

Mostly I avoid train stopping loads in the .357 & .44 handguns.

With luck I'll spot some of the Alliant MP, and see how it works in my carbines.
 

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I also "feel" that full throttle loads using 2400 produce less "felt recoil" than loads using H110 in both the .357 and 44 magnums. Not sure why, they just do.

RJ
 
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