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Speed of sound ?
I got out and ran a few test loads through my recently built 300-221 Fireball 10.5" Noveske barreled AR today. I loaded 200 gr. Sierra Game King bullets with Rem 7 1/2 primers over H110 powder. I started by loading 5 rds. each of 9.5, 9.6, 9.7, & 9.8 grains of powder. Temperature today was approx 70 Degs. and elevation is approx 5900 ft. I had the 9.5 grn loads down to 995.8 fps and I swear that it still sounded super sonic. (This is through a AAC 762SD). I haven't loaded any down at lower powder charges yet, but I figured that at approximately 1000 fps I should be nice and quiet. Any input? Thanks
NT
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