I know someone tested BH using 209 primers, but this test is using LRMP's and Arrowhead rifles module system. BH209 ignition in -3° temp. 21hrs ago I swabbed my barrel of lubricants with a 50/50 mixture of 91% alcohol and Hoppes. After swabbing out any lubricants, I ran 2 dry patches down the bore. I loaded the rifle with 100grs by weight of BH (NOT FOR PRODUCTION RIFLES), added a .060" veggie wad, then loaded a 300gr Fury ST2 bullet seated tight. Then the rifle was put into an unheated second garage and left for 21hrs. I got the rifle out and left it on the porch for an hour prior to discharging it. Dang it is cold! There was not one single bit of hesitation in ignition. Spot on! I have 100% confidence in my rifle, this load and the Arrowhead rifles LRMP's in modules.