Think I Found A New Love Magnum Powder

[mr.revolverguy]

At least for 357 Magnum I have. Greater velocity over H110 with less pressure, I didn't think it was possible. I could not test pressure but velocity and gel test was fun.





https://dayattherange.com/?p=10201
https://dayattherange.com/?p=10262

[Mike D]

300MP is a great under appreciated powder.


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[gadabout]

I have used it for 41AE and it worked great. I found some Power Pistol so haven't had to use 300mp lately as i haven't shot 41AE in a while. Craig

[sparkyv]

Can 300MP be used for 10mm loads?  Alliant doesn't show any 10mm load data.

[mr.revolverguy]

You read my mind I have been looking all over for 10MM loads. Even looked at the updated quickload info and GRT and the powder is not included yet.

[The_Shadow]

300MP like 296/H-110 usually need a tight crimp to get the powder burning before the bullet starts to head on out the casing.
Likely see lots of unburned powder in 10mm.
Using a bullet sealant might would help for better ignition properties if tested.

[John A.]

I have some fast (16") loads.   If memory serves me, they were lighter bullets, but were in the mid 1800's somewhere?

I can try to find my notes if you'd like, but for a 158 gr bullet that you were testing, that will surely put meat on the table!

[mr.revolverguy]

John they were 170gr Freedom Pills

[Rooster41]

Great videos sir!! Been watching your videos for quite sometime. First was your review of the Taurus Raging Hunter. But anyway, I have been using H110 and 140 grain for my Marlin 1894 for quite a few years. Ive never chronoed them, but it is a good fit for my rifle. But I am almost out of H110. I am going to have to give this 300MP a look I think.

[John A.]

John they were 170gr Freedom Pills

Even better.

[Current Resident]

The new one for me is Lil Gun under Montana 180gr hard cast. Clone 180 gr Buffalo Bore out my kids 6 inch 686 in the neighborhood of 1400 fps.