CoalCrackerAl
Member
Can it be loaded close to IMR 4227 data? I have a bottle and i don't use it much.
I decided to keep the 300 MP for magum 44 loads for my carbine. Not worth taking the chance.
From "Same or Comparable Powders ..." thread, 300-MP is listed "comparable" to W296/H110 and Accurate 11FS - https://www.thehighroad.org/index.p...-under-different-labels.890893/#post-12318114I find 300 MP close to H-110Power Pro 300 MP ... Can it be loaded close to IMR 4227 data?
Keep in mind that Alliant’s impressive load data for .357 Magnum is achieved with a 10” barrel with no barrel/cylinder gap. You won’t come anywhere close to their numbers unless you are shooting a 10” barrel T/C Contender. In my experience you might eke out another 50-75 fps over H-110/W-296 at maximum charge levels.Always wanted to try some 300-MP in 357 due to Alliants impressive load data figures but never found any nearby.
Keep in mind that Alliant’s impressive load data for .357 Magnum is achieved with a 10” barrel with no barrel/cylinder gap. You won’t come anywhere close to their numbers unless you are shooting a 10” barrel T/C Contender. In my experience you might eke out another 50-75 fps over H-110/W-296 at maximum charge levels.
Emphasis on might gain 50 fps. And in a conventional revolver, I.e. my 6” GP-100, 158 gr JHP’s achieved around 1,300 fps on the chronograph with both W-296 and 300-MP. Alliant Power Pro 300-MP is a decent powder for .357 Magnum, but probably offers more in carbine length barrels than conventional revolvers. At least, that has been my experience. YMMV1620fps with 170gn SP even reduced to 6" and cylinder is still a 800ftlbs energy load, into 44 mag levels.
As to 'eking out 50-75fps' more than H-110/w-296.... a powder that beats Win 296 by 75fps isnt impressive? I wasnt actually sure 300-MP was more powerful than Win 296 to be honest but if it is, wow.
Emphasis on might gain 50 fps. And in a conventional revolver, I.e. my 6” GP-100, 158 gr JHP’s achieved around 1,300 fps on the chronograph with both W-296 and 300-MP. Alliant Power Pro 300-MP is a decent powder for .357 Magnum, but probably offers more in carbine length barrels than conventional revolvers. At least, that has been my experience. YMMV
At one point I was almost ready to pop for a jug of 300 MP. I wanted to get away from H110 as I was having issues with poor ignition. The burn rate seemed about right for my needs and reports by those using it were good.
However, most of my use for this powder would be in 357 Max and I could find zero pressure tested load data. I kept putting off the purchase due to the lack of data and then I found some milsurp 680 available (comparable to AA 1680). The 680 did great and I was later able to stock up when I found some more that became available.
It is a shame that this is probably a really good powder, but it does not have anywhere near as much load data as it deserves.
I haven't reloaded for 7.62x39. But 300-MP seems to work so far with 300 Blk. Just thought I'd throw that out there.300mp in my opinion is too fast for 7.62x39. I would not use that combination. CFE BLK is the best 7.62x39 powder on the market in my opinion.
That’s my issue with all of Aliant’s products. Their load data is horrible! Plus they will go for years between having some of their powders in stock.