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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Hexagonal Boron Nitride
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<blockquote data-quote="lynxpilot" data-source="post: 1069353" data-attributes="member: 23349"><p>I just started using it. I'm using it on 50 BMG projectiles. I tumble them in a plastic peanut butter jar in a rotary tumbler with regular old BBs for about 1 1/2 hours. Wipe clean and load. I cleaned the barrel with WipeOut foam a few times until it was absolutely spotless. Made a suspension of HBN in alcohol and ran a soaked patch in the barrel as well. After the first shoot, I had no copper whatsoever on the subsequent cleaning. I didn't have chrono data from previous shoots without the coating to compare, and apologize for that, but the load I'm using is at the high end and without the coating, I suspect I'd be showing pressure signs. I loaded quite a few rounds in sets of 3 at increasing powder charge and found the sweet spot at the second one. Group was sub-MOA. I haven't run a chrono yet. That's for next time out. After that, I'll be able to plug the numbers in the ballistic calculator and develop my cheater card for the long shots.</p><p> </p><p> The biggest reason I wanted to coat was cold-bore to hot-bore consistency. From what I've read, the reduced friction lowers pressure and velocity, so you comp with increased charge (as stated previously here). I skipped the step of doing it without coating, so I defer to those with comparative experience. I only recently got the rifle and since the rounds are so stoopid expensive, I figured I'd go right to the end game without all the intermediate steps to find my sweet load.</p><p> </p><p> So far, it's easy and clean to work with. I've heard Moly is a mess and fully understand that having used Moly grease on power plant components.</p><p> </p><p> I'm told the barrel-coating part of it helps extend accuracy over a lot more rounds between cleaning. That part is important to me.</p></blockquote><p></p>
[QUOTE="lynxpilot, post: 1069353, member: 23349"] I just started using it. I'm using it on 50 BMG projectiles. I tumble them in a plastic peanut butter jar in a rotary tumbler with regular old BBs for about 1 1/2 hours. Wipe clean and load. I cleaned the barrel with WipeOut foam a few times until it was absolutely spotless. Made a suspension of HBN in alcohol and ran a soaked patch in the barrel as well. After the first shoot, I had no copper whatsoever on the subsequent cleaning. I didn't have chrono data from previous shoots without the coating to compare, and apologize for that, but the load I'm using is at the high end and without the coating, I suspect I'd be showing pressure signs. I loaded quite a few rounds in sets of 3 at increasing powder charge and found the sweet spot at the second one. Group was sub-MOA. I haven't run a chrono yet. That's for next time out. After that, I'll be able to plug the numbers in the ballistic calculator and develop my cheater card for the long shots. The biggest reason I wanted to coat was cold-bore to hot-bore consistency. From what I've read, the reduced friction lowers pressure and velocity, so you comp with increased charge (as stated previously here). I skipped the step of doing it without coating, so I defer to those with comparative experience. I only recently got the rifle and since the rounds are so stoopid expensive, I figured I'd go right to the end game without all the intermediate steps to find my sweet load. So far, it's easy and clean to work with. I've heard Moly is a mess and fully understand that having used Moly grease on power plant components. I'm told the barrel-coating part of it helps extend accuracy over a lot more rounds between cleaning. That part is important to me. [/QUOTE]
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