I went into one of my old gear boxes and dug out a Uniflow that's closing in on 40 years old. At some point my father had added the "micrometer" adjustment to it.
I completely disassembled it, cleaned it up, and ran a Dremel burr tool and a rat tail file in the hole at the bottom of the body casting. There were a few casting nubs at the narrow part of the neck. This part of the Uniflow looks to be a bit larger than the similar constriction in my Redding BR30.
A test with 4166 shows this may be measure for my use of this powder. It metered smoothly, didn't bridge, and threw a string of charges -0/+.1 grains.
Forgot to say: I'm going to be using more 4166 now that mass production will be easier. It's a bit more expensive than Varget, but the top charges are about two grains lower for very similar velocities in my 308's. At today's prices this is worth about $1.75 a pound, so the per shot cost is nearly a wash.
The accuracy is great too.
Last edited by mathman; 02/13/16. Reason: added text
