My experience so far with the IMR 4227 is that it is slightly down on velocity to H110 and A1680, but not enough to really make a difference at the effective range of the 300 BLK.plus you can actually find 4227 and it works well enough for me that I will not be looking for the hard to find stuff any time soon. Ended up with decent accuracy using 16.5 grains and a COL of 2.200". ![]() My plinking load ended up being the Hornady 150gr FMJ (w/cannelure) I use this in bulk for my 308 plinking/training rounds so I figured I would give it a try. It seems the top powders for 180-200 gr bullets in 10mm are Blue Dot, Longshot, AA9, and VVN105. This is where you will be able to find 300 blackout load data with links to PDFs, websites, and other great FREE resources all compiled for you to use The 300 blackou t is such a neat cartridge, very versatile. ![]() (ft/s) PRESSURE 223 Remington 55 GR HDY FMJ Hodgdon Tite Group. Published by blueridgebrass2 on May 31, 2019. Vmax load will pretty much almost have all shots in a 5 shot group touching.I use 19.0 grains with the same primer and a COL of 2.05" Starting Loads Maximum Loads CALIBER BULLET WEIGHT MANUFACTURER POWDER. It gave the best accuracy.I know Sierra says 18.7 grains was their "accuracy" load, but in mine (18" Wilson combat upper) 18.3 shoots about 1/8-1/4 inch tighter groups at 100 yds in my 300. I am using 18.3 grains for it.COL is 2.210", and I use the CCI #41 military small rifle primers
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