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.
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300MP is a great under appreciated powder.
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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
Can 300MP be used for 10mm loads? Alliant doesn't show any 10mm load data.
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.
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.
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!
John they were 170gr Freedom Pills
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.
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.