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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hexagonal Boron Nitride
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<blockquote data-quote="Pdvdh" data-source="post: 1077374" data-attributes="member: 4191"><p>Haven't gotten that far with the chronograph testing yet Steve. Lower ES & SD are primary reasons I began HBN coating bullets. Improved cold bore first round POI consistency was another. These benefits are being reported very consistently and I fully expect to realize them. Reduced copper and carbon fouling is already evident in a factory AR-15 barrel I shoot that's proven to collect copper, so that's another very consistently reported benefit. </p><p></p><p>The additional 30fps MV in my 300 Win Mag is about what I expected based on the majority of the reporting I've read. My 300 Win Mag is the best rifle I have to compare uncoated bullet MV to HBN coated bullet MV, because I've run Lapua brass at full tilt pressure loads with the Berger 210gr VLDs for the past 7 years. I'm testing that rifle with all of the same components now - even the same LOT of IMR 7828 powder - so I'm satisfied stating my gain in MV using HBN coated bullets in this rifle is ~30-35fps. Not the much higher gains occasionally reported by others.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1077374, member: 4191"] Haven't gotten that far with the chronograph testing yet Steve. Lower ES & SD are primary reasons I began HBN coating bullets. Improved cold bore first round POI consistency was another. These benefits are being reported very consistently and I fully expect to realize them. Reduced copper and carbon fouling is already evident in a factory AR-15 barrel I shoot that's proven to collect copper, so that's another very consistently reported benefit. The additional 30fps MV in my 300 Win Mag is about what I expected based on the majority of the reporting I've read. My 300 Win Mag is the best rifle I have to compare uncoated bullet MV to HBN coated bullet MV, because I've run Lapua brass at full tilt pressure loads with the Berger 210gr VLDs for the past 7 years. I'm testing that rifle with all of the same components now - even the same LOT of IMR 7828 powder - so I'm satisfied stating my gain in MV using HBN coated bullets in this rifle is ~30-35fps. Not the much higher gains occasionally reported by others. [/QUOTE]
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Hexagonal Boron Nitride
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