Has anyone figured out the appropriate value for Quickload when using HBN coating? Is it consistent across calibers? The "friction proofed" value would be between 0.66 and 1.0 I would guess. Wondering what your experience has been.
Quickload with HBN
- Thread starter Carolina Hillbilly
- Start date
I've never seen convincing proof that HBN reduces friction significantly. There are more direct links to reduced fouling and more consistent cold bore shots. Lots of claims, but no pressure curves showing the same velocities with lower pressures or other convincing support.
I went through a "coat everything with HBN" phase a few years ago. I observed pressure signs in the brass for the same loads as uncoated. There did seem to be less copper in the bore. But eventually I came to conclude it was more trouble that it was worth. Cleaning the copper out was easier than coating bullets, and there was no detectable increase in accuracy or consistency for the kind of shooting of interest.
I went through a "coat everything with HBN" phase a few years ago. I observed pressure signs in the brass for the same loads as uncoated. There did seem to be less copper in the bore. But eventually I came to conclude it was more trouble that it was worth. Cleaning the copper out was easier than coating bullets, and there was no detectable increase in accuracy or consistency for the kind of shooting of interest.
Keith Glasscock
Gold $$ Contributor
I tried HBN with my first 284. I had to increase the powder charge a bit for the same velocity, and could hit a little higher velocity with coated vs naked bullets without pressure signs.
I never could get the QL data to match up with just a friction change. I ended up having to tweak everything.
I never could get the QL data to match up with just a friction change. I ended up having to tweak everything.
I wouldn't mess with the friction setting, and like Berger.fan I doubt it actually affects MV.
I use WS2, which has an incredibly low friction coefficient, and it does not affect muzzle velocity.
Back when moly was more commonly used, it did reduce MV, but this was NOT due to friction reduction. It was due to peak charge cooling as it vaporized.
I use WS2, which has an incredibly low friction coefficient, and it does not affect muzzle velocity.
Back when moly was more commonly used, it did reduce MV, but this was NOT due to friction reduction. It was due to peak charge cooling as it vaporized.
That sounds like rocket science, what does that all mean? I've been wanting to switch to David Tubb's coated RBT bullets, so I'm looking for info too.
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