04 August 2019
It was all posted on another forum by goodsteel and Lars (who makes White Label Lubes) who conducted an extensive bullet recovery test. I also reported on goodsteel's forum, the CBF forum and on this forum the results of my HV bullet recovery test.....including numerous pictures. Others have reported recovering bullets that were little damaged yet of less than groove diameter.
"Under what condition of pressure/velocity/alloy have you observed bullets getting smaller? What mechanism would do such a thing? I ain't swaging."
I ran my tests recovering HV 30 XCB bullets at 300 yards shot into wet news print with muzzle velocity of 2900 fps and impact velocity at 1900 +/- fps. Goodsteep and Lars conducted their testing at velocities of mid teens to 2600 fps. They built a sawdust bullet trap.
Yes it is swaging. The naked lubed bullet rides on a thin layer of lube in the bore. The lube is not compressible (laws of hydraulics is what would do such a thing), thus the bullet is swaged down to the groove diameter plus the layer of lube. It ain't rocket science just hard to conceive at first.......just have to think about it is all...... the bullet is swaged down to the bore plus the layer of lube it has to travel over.
I have observed the smaller than groove diameter phenomenon at very low end pressures in 1000+/- fps loads up to the mentioned 2900 fps load at 50,000 psi. That's actual measured psi btw, not questimated.
Perhaps instead of me re-posting all the time for 45 2.1 whims he could post pictures of his own recovered bullets. Or maybe even do a search of past posts. Or anyone is free to take a naked lubed bullet load and shoot several into a medium where the bullets can be recovered relatively undamaged and then measure the diameter. Perhaps omeone else can conduct a similar test and report back?
Is there a search engine for this forum?
Concealment is not cover.........