I have 5 lbs. of H870 and have been working up some loads for my 300WM & I must say that I am pleasantly surprised. I loaded up 10 rounds each of a Hornady 212 ELD-X with 82.0 gr., 83.0 gr. & 84.0 gr. Seated bullet to a 2.918" base to ogive length (3.629" COAL). This left me w/ a 0.008"bullet jump. Got the following results:
charge........Avg. FPS.......ES........SD
82.0 gr. ....... 2725..........13.......9.43
83.0 gr...........2766..........20.......8.30
84.0 gr...........2782..........23......12.91
83.0 gr. was slightly compressed, but not much. 84.0 far more compressed than I like. I previously loaded from 78 gr. to 83 gr. & the higher loadings performed better. I will load 10 more at 82.0, 82.5 & 83.0 & settle in on a load. Just hoping to stay in single digit SDs. After picking a load it will be time to build a dope card out to 1000 yds.!
I was also surprised how cool powder was. After 20 rounds the barrel & suppressor were very cool to the touch, as were the ejected cases.
charge........Avg. FPS.......ES........SD
82.0 gr. ....... 2725..........13.......9.43
83.0 gr...........2766..........20.......8.30
84.0 gr...........2782..........23......12.91
83.0 gr. was slightly compressed, but not much. 84.0 far more compressed than I like. I previously loaded from 78 gr. to 83 gr. & the higher loadings performed better. I will load 10 more at 82.0, 82.5 & 83.0 & settle in on a load. Just hoping to stay in single digit SDs. After picking a load it will be time to build a dope card out to 1000 yds.!
I was also surprised how cool powder was. After 20 rounds the barrel & suppressor were very cool to the touch, as were the ejected cases.
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