If it's any help I'm running 43.5grn 2206h and a 150 speer btsp out of an adi case in a 16inch barrel to get 2650fps tested in .5 upto 45grns and gained bugger all. Same case and powder but a sierra sbt 165 with 42.5 was coming out at 2450fps
If it's any help I'm running 43.5grn 2206h and a 150 speer btsp out of an adi case in a 16inch barrel to get 2650fps tested in .5 upto 45grns and gained bugger all. Same case and powder but a sierra sbt 165 with 42.5 was coming out at 2450fps
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