Whitespider
06-24-2007, 08:44 AM
:coffee:
I did a quick search, didn’t find an answer for this.
I was lubing some Lee Tumble Lube boolits this AM, and started to wonder about something. Looking at and comparing the bearing surface of the TL verses a more traditional, single lube groove design. I started to wonder how much effect the difference in bearing surface would have on velocity, and therefor pressure. To “test” this I would need another boolit of the same weight, and same approximate base to front driving band length.
I was going to shoot both designs, with identical primers and powder charges, over my chronograph. The TL boolit I have is a .41 caliber SWC, the only other .41 I have is a commercially hard cast SWC. The dimensions and weight are close enough, and I could remove the lube and use the same stuff I lube my TLs with. But the alloy is not the same and the hard cast are about .001+ undersize for my gun. After some consideration I decided my “test” wouldn’t be valid.
Has anyone “tested” this, or read anything about this? Does the TL design have a significant effect on pressure and velocity? Higher? Lower?
I did a quick search, didn’t find an answer for this.
I was lubing some Lee Tumble Lube boolits this AM, and started to wonder about something. Looking at and comparing the bearing surface of the TL verses a more traditional, single lube groove design. I started to wonder how much effect the difference in bearing surface would have on velocity, and therefor pressure. To “test” this I would need another boolit of the same weight, and same approximate base to front driving band length.
I was going to shoot both designs, with identical primers and powder charges, over my chronograph. The TL boolit I have is a .41 caliber SWC, the only other .41 I have is a commercially hard cast SWC. The dimensions and weight are close enough, and I could remove the lube and use the same stuff I lube my TLs with. But the alloy is not the same and the hard cast are about .001+ undersize for my gun. After some consideration I decided my “test” wouldn’t be valid.
Has anyone “tested” this, or read anything about this? Does the TL design have a significant effect on pressure and velocity? Higher? Lower?