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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
HBN Bullet Coating
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<blockquote data-quote="65WSM" data-source="post: 2958070" data-attributes="member: 9551"><p>What if cleaning a rifle bore, at the end of your cases, is brushing out a slippery white ring, instead of a diamond hard black ring? What if HBN or some other bullet coating, can reduce the strokes with a brush or the number of patches by half? What if I believe it is more like two thirds less trouble to clean a rifle bore after fifty rounds? </p><p></p><p>My bore scope will go down twenty caliber barrels but not the seventeens. My gunsmith and I were curious after my .17 Remington would not hold groups better than 5 inches at 300 yards. We performed an autopsy. We found that the rifling was gone for two inches past the chamber. Secondly, we found the first half of the inside of the bore was coated white. The muzzle half of the barrel was heavily copper coated. My conclusion is that I was never able to get enough HBN on the 25 grain bullets to be helpful for the second half of the bore. Each bullet ran out of white HBN and deposited copper from there forward. Handloading the .17 Remington, I conclude that it is very overbore. I would build a .17 -222 Remington, at most, if I had it to do again. I never did fill the case, every cartridge rattled when you shook it, yet the tiny 25 gr bullets traveled well in excess of 4000 fps. I have a .17 Fireball now, and find it is more accurate and about 200 fps slower with a 26 inch factory Remington barrel. And I fill the cases.</p></blockquote><p></p>
[QUOTE="65WSM, post: 2958070, member: 9551"] What if cleaning a rifle bore, at the end of your cases, is brushing out a slippery white ring, instead of a diamond hard black ring? What if HBN or some other bullet coating, can reduce the strokes with a brush or the number of patches by half? What if I believe it is more like two thirds less trouble to clean a rifle bore after fifty rounds? My bore scope will go down twenty caliber barrels but not the seventeens. My gunsmith and I were curious after my .17 Remington would not hold groups better than 5 inches at 300 yards. We performed an autopsy. We found that the rifling was gone for two inches past the chamber. Secondly, we found the first half of the inside of the bore was coated white. The muzzle half of the barrel was heavily copper coated. My conclusion is that I was never able to get enough HBN on the 25 grain bullets to be helpful for the second half of the bore. Each bullet ran out of white HBN and deposited copper from there forward. Handloading the .17 Remington, I conclude that it is very overbore. I would build a .17 -222 Remington, at most, if I had it to do again. I never did fill the case, every cartridge rattled when you shook it, yet the tiny 25 gr bullets traveled well in excess of 4000 fps. I have a .17 Fireball now, and find it is more accurate and about 200 fps slower with a 26 inch factory Remington barrel. And I fill the cases. [/QUOTE]
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